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How to update RadGrid programatically without SessionDataSource and update parameters ?

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RadTony
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RadTony asked on 04 Feb 2010, 05:07 PM
Here is my code : just change the datasource to northwind database in "GetConnectionString()" method

I'm only able to edit EmployeeID = 2 ... in RadGrid2 ... All other rows can't get edited.
Besides, I'm unable to update the only editable row (EmployeeID = 2) ... 

Must I add "NeedDataSource" or something like that for RadGrid2 ? 

Any help would be great, because this is a basic thing and I waste a lot of time to figure out how to do with Telerik component ...
Is it possible to have an "EditItemTemplate" instead of all columns spreaded vertically when I click "edit" button ?

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="RadGridMarche2.aspx.cs" Inherits="RadGridMarche2" %> 
 
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd"> 
 
 
<%@ Register Assembly="Telerik.Web.UI" Namespace="Telerik.Web.UI" TagPrefix="telerik" %> 
 
<html xmlns="http://www.w3.org/1999/xhtml"
<head> 
   <title></title
    <style type="text/css"
      .StaticColumn 
      {     
          font-family: Arial,Verdana, Helvetica; 
        font-size: 14px; 
        font-weight: normal;    
          border: none; 
          position: relative; 
      }  
  
        .RadGrid td{padding:0}  
         
       .rgExpand   
        {   
          background:url('Images/CollapsedButton.gif') center no-repeat !important;        
        }   
       
       .rgCollapse   
        {   
          background:url('Images/ExpandedButton.gif') center no-repeat !important;   
        }  
         
.RadGrid_Vista tr.DetailRow 
    background:#ebe4d6; 
 
.DetailTable_Vista 
    background:#f4ede1; 
 
.RadGrid_Vista .DetailTable_Vista .GridHeader_Vista, 
.RadGrid_Vista .DetailTable_Vista .ResizeHeader_Vista 
    padding-top:2px; 
    padding-bottom:2px; 
    background-position:0 -6px; 
}         
    </style>      
</head> 
<body> 
    <form runat="server" id="mainForm" method="post">         
      <telerik:RadScriptManager ID="RadScriptManager1" runat="server" /> 
        <!-- content start --> 
        <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server"
            <AjaxSettings> 
                <telerik:AjaxSetting AjaxControlID="RadGrid1"
                    <UpdatedControls> 
                        <telerik:AjaxUpdatedControl ControlID="RadGrid1" />   
                        <telerik:AjaxUpdatedControl ControlID="RadGrid2" />                       
                    </UpdatedControls> 
                </telerik:AjaxSetting> 
            </AjaxSettings> 
        </telerik:RadAjaxManager> 
        <!-- DataSourceID="SqlDataSource1" --> 
        <br /> 
            <asp:Label ID="LblRadgrid1_height" runat="server" Width="900px" BackColor="red"></asp:Label> 
        <br /> 
        <table border="0" cellspacing="0" cellpadding="0" style="height:auto;">  
        <tr> 
        <td style="vertical-align:top;height:auto;">         
        <telerik:RadGrid ID="RadGrid1" Skin="Vista" OnPreRender="RadGrid1_PreRender"  
                runat="server" DataSourceID="SqlDataSource1"  OnColumnCreated="RadGrid1_ColumnCreated" 
            OnItemCreated="RadGrid1_ItemCreated" OnItemDataBound="RadGrid1_ItemDataBound"  
                Width="100%" onselectedindexchanged="RadGrid1_SelectedIndexChanged"
            <MasterTableView  HierarchyDefaultExpanded="false" EnableNoRecordsTemplate="false" HierarchyLoadMode="ServerBind" AllowSorting="true" Width="800px" 
                DataKeyNames="EmployeeID" ExpandCollapseColumn-ButtonType="ImageButton" ExpandCollapseColumn-Display="true" 
                ExpandCollapseColumn-ExpandImageUrl="Images/CollapsedButton.gif" ExpandCollapseColumn-CollapseImageUrl="Images/ExpandedButton.gif"
                <ItemStyle Wrap="false" Width="200px" BackColor="Azure" Height="17px" BorderWidth="1"/> 
                <AlternatingItemStyle Wrap="false" BackColor="BlanchedAlmond" Width="200px" Height="17px" BorderWidth="1"/> 
                <HeaderStyle Wrap="false" Width="1500px" Height="20px"/> 
                 
                <SelfHierarchySettings ParentKeyName="ReportsTo" KeyName="EmployeeID"/>                 
                 
            </MasterTableView> 
             
            <ClientSettings AllowExpandCollapse="true" EnablePostBackOnRowClick="true" EnableRowHoverStyle="true">       
            <Selecting AllowRowSelect="true" />       
            </ClientSettings> 
        </telerik:RadGrid> 
        </td> 
        <td style="vertical-align:top;height:100%;">  
            <table style="vertical-align:top" cellpadding="0" cellspacing="0">  
                <tr valign="top"
                   <td valign="top">  
                        <div style="width:800px;overflow:scroll; vertical-align:top;"
                            <telerik:RadGrid ID="RadGrid2" ShowStatusBar="true" EnableViewState="true" AllowAutomaticUpdates="True"  
                            OnItemUpdated="RadGrid2_ItemUpdated" 
                runat="server" AutoGenerateColumns="false" AllowSorting="False" AllowMultiRowSelection="False" Width="800px" GridLines="None"
                <MasterTableView ItemStyle-Wrap="false" Name="Employees" DataKeyNames="EmployeeID" >                   
                <HeaderStyle Wrap="false" Height="20px"/>             
                <AlternatingItemStyle Height="17px" Width="200px" BackColor="BlanchedAlmond" Wrap="false" />  
                <ItemStyle Height="17px" Width="100px" BackColor="Azure" Wrap="false" />             
                    <Columns>  
                      
                        <telerik:GridBoundColumn SortExpression="EmployeeID" HeaderText="EmployeeID" HeaderButtonType="TextButton" 
                            DataField="EmployeeID" UniqueName="EmployeeID" ItemStyle-Height="17px"
                        </telerik:GridBoundColumn> 
                        <telerik:GridBoundColumn SortExpression="LastName" HeaderText="LastName" HeaderButtonType="TextButton" 
                            DataField="LastName" UniqueName="LastName" ItemStyle-Height="17px"
                        </telerik:GridBoundColumn> 
                        <telerik:GridBoundColumn SortExpression="FirstName" HeaderText="FirstName" HeaderButtonType="TextButton" 
                            DataField="FirstName" UniqueName="FirstName" ItemStyle-Height="17px"
                        </telerik:GridBoundColumn> 
                        <telerik:GridBoundColumn SortExpression="Title" HeaderText="Title" HeaderButtonType="TextButton" 
                            DataField="Title" UniqueName="Title" ItemStyle-Height="17px"
                        </telerik:GridBoundColumn> 
                        <telerik:GridBoundColumn SortExpression="ReportsTo" HeaderText="ReportsTo" HeaderButtonType="TextButton" 
                            DataField="ReportsTo" UniqueName="ReportsTo" ItemStyle-Height="17px"
                        </telerik:GridBoundColumn>  
                        <telerik:GridEditCommandColumn Display="true" EditImageUrl="Images/ExpandedButton.gif" AutoPostBackOnFilter="true"
                        </telerik:GridEditCommandColumn>                                                       
                    </Columns> 
                </MasterTableView> 
                <clientsettings allowexpandcollapse="false" EnableRowHoverStyle="true">                 
                        <Scrolling AllowScroll="false" UseStaticHeaders="true"></Scrolling>                                                                                    
                </clientsettings>      
                        
            </telerik:RadGrid> 
                        </div> 
                    </td> 
                </tr> 
            </table> 
        </td> 
         
        </tr>         
        </table>         
        <asp:SqlDataSource ID="SqlDataSource1" ConnectionString="<%$ ConnectionStrings:NorthwindConnectionString %>" 
            ProviderName="System.Data.SqlClient" SelectCommand="SELECT EmployeeID, LastName, FirstName, Title, ReportsTo from Employees" 
            runat="server" UpdateCommand="UPDATE [Employees] SET [LastName] = ?, [Company] = ? [FirstName] = ?, [Title]= ? WHERE [EmployeeID] = ?" 
             OldValuesParameterFormatString="original_{0}" ConflictDetection="CompareAllValues"
            <UpdateParameters> 
                <asp:Parameter Name="LastName" Type="String" /> 
                <asp:Parameter Name="FirstName" Type="String" /> 
                <asp:Parameter Name="Title" Type="String" /> 
                <asp:Parameter Name="original_LastName" Type="String" /> 
                <asp:Parameter Name="original_FirstName" Type="String" /> 
                <asp:Parameter Name="original_Title" Type="String" /> 
            </UpdateParameters>            
         </asp:SqlDataSource> 
        <!-- content end --> 
    </form> 
</body> 
</html> 
 
 
----------------------------------- 
 
 
using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using Telerik.Web.UI; 
using System.Reflection; 
using System.Data; 
using System.Data.SqlClient; 
 
public partial class RadGridMarche2 : System.Web.UI.Page 
 
    public void Page_Load(object sender, EventArgs e) 
    { 
        bindGrid2(); 
        
        if (Assembly.GetAssembly(typeof(ScriptManager)).FullName.IndexOf("3.5") != -1) 
        { 
            RadGrid1.MasterTableView.FilterExpression = @"it[""ReportsTo""] = Convert.DBNull"; 
        } 
        else 
        { 
            RadGrid1.MasterTableView.FilterExpression = "ReportsTo IS NULL"
        } 
         
        if (RadGrid1.MasterTableView.DetailTables != null) 
        { 
            RadGrid1.MasterTableView.DetailTables[0].AlternatingItemStyle.BackColor = System.Drawing.Color.Azure  ; 
            RadGrid1.MasterTableView.DetailTables[0].ItemStyle.BackColor = System.Drawing.Color.BlanchedAlmond; 
 
            if (RadGrid1.MasterTableView.DetailTables[0].DetailTables[0] != null) 
            { 
                RadGrid1.MasterTableView.DetailTables[0].DetailTables[0].AlternatingItemStyle.BackColor = System.Drawing.Color.Azure; 
                RadGrid1.MasterTableView.DetailTables[0].DetailTables[0].ItemStyle.BackColor = System.Drawing.Color.BlanchedAlmond; 
            } 
        } 
         
 
    } 
 
    public void Page_PreRenderComplete(object sender, EventArgs e) 
    { 
        HideExpandColumnRecursive(RadGrid1.MasterTableView); 
 
        string ActualNodes = string.Empty; 
 
        int counterVisibleNodes = 0
        foreach (GridDataItem dataItem in RadGrid1.Items) 
        { 
            if (dataItem.Visible) 
            { 
                ActualNodes += dataItem["EmployeeID"].Text + ","; 
                counterVisibleNodes++; 
            } 
        } 
 
 
        if (ActualNodes.Length > 0) 
            ActualNodesActualNodes = ActualNodes.Substring(0, ActualNodes.Length - 1); 
         
        RadGrid2.Controls.Clear(); 
        RadGrid2.DataSource = getDetails(ActualNodes); 
        RadGrid2.DataBind(); 
         
        if (Session["RadGrid1_SelectedValue"] != null) 
        { 
            for (int m = 0; m < RadGrid2.Items.Count; m++) 
            { 
                if (RadGrid2.Items[m]["EmployeeID"].Text.Equals(Session["RadGrid1_SelectedValue"].ToString())) 
                { 
                    RadGrid2.Items[m].Selected = true
                    break; 
                } 
            } 
            Session.Remove("RadGrid1_SelectedValue"); 
        } 
 
 
    } 
 
    public void HideExpandColumnRecursive(GridTableView tableView) 
    { 
        GridItem[] nestedViewItems = tableView.GetItems(GridItemType.NestedView); 
        foreach (GridNestedViewItem nestedViewItem in nestedViewItems) 
        { 
            foreach (GridTableView nestedView in nestedViewItem.NestedTableViews) 
            { 
                nestedView.Style["border"] = "0"; 
 
                Button MyExpandCollapseButton = (Button)nestedView.ParentItem.FindControl("MyExpandCollapseButton"); 
                if (nestedView.Items.Count == 0) 
                { 
                    if (MyExpandCollapseButton != null) 
                    { 
                        MyExpandCollapseButton.Style["visibility"] = "hidden"; 
                    } 
                    nestedViewItem.Visible = false
                } 
                else 
                { 
                    if (MyExpandCollapseButton != null) 
                    { 
                        MyExpandCollapseButton.Style.Remove("visibility"); 
                    } 
                } 
 
                if (nestedView.HasDetailTables) 
                { 
                    HideExpandColumnRecursive(nestedView); 
                } 
            } 
        } 
    } 
 
    protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e) 
    { 
        CreateExpandCollapseButton(e.Item, "EmployeeID"); 
 
        if (e.Item is GridHeaderItem && e.Item.OwnerTableView != RadGrid1.MasterTableView) 
        { 
            e.Item.Style["display"] = "none"; 
        } 
 
        if (e.Item is GridNestedViewItem) 
        { 
            e.Item.Cells[0].Visible = false
 
            Table table = (Table)e.Item.OwnerTableView.Controls[0]; 
 
            GridItem prevItem = (GridItem)table.Rows[table.Rows.Count - 1]; 
            // Why -3? We need to skip the NestedViewItem and the preceding DataItem's invisible EditItem 
 
            if (prevItem.ItemType == GridItemType.AlternatingItem) 
            { 
                e.Item.CssClass = "DetailAltRow"
            } 
            else 
            { 
                e.Item.CssClass = "DetailRow"
            } 
            /* 
            e.Item.Cells[0].CssClass = "DetailRowCell"
            e.Item.Cells[1].CssClass = "DetailRowCell"
             */ 
        } 
 
    
    } 
 
    protected void RadGrid1_ColumnCreated(object sender, GridColumnCreatedEventArgs e) 
    { 
        if (e.Column is GridExpandColumn) 
        { 
            e.Column.Visible = false
        } 
        else if (e.Column is GridBoundColumn) 
        { 
            e.Column.HeaderStyle.Width = Unit.Pixel(100); 
        } 
    } 
 
    protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e) 
    { 
        CreateExpandCollapseButton(e.Item, "EmployeeID"); 
    } 
 
    public void CreateExpandCollapseButton(GridItem item, string columnUniqueName) 
    { 
        if (item is GridDataItem) 
        { 
            if (item.FindControl("MyExpandCollapseButton") == null) 
            { 
                Button button = new Button(); 
                button.Click += new EventHandler(button_Click); 
                button.CommandName = "ExpandCollapse"
                button.CssClass = (item.Expanded) ? "rgCollapse" : "rgExpand"; 
                button.ID = "MyExpandCollapseButton"
 
                if (item.OwnerTableView.HierarchyLoadMode == GridChildLoadMode.Client) 
                { 
                    string script = String.Format(@"$find(""{0}"")._toggleExpand(this, event); return false;", item.Parent.Parent.ClientID); 
 
                    button.OnClientClick = script
                } 
 
                int level = item.ItemIndexHierarchical.Split(':').Length; 
                if (level > 1) 
                { 
                    button.Style["margin-left"] = level + 10 + "px"; 
                    button.Style["height"] = "15px"; 
                } 
 
 
                TableCell cell = ((GridDataItem)item)[columnUniqueName]; 
                cell.Controls.Add(button); 
 
                LiteralControl liSpace = new LiteralControl("&nbsp;"); 
                cell.Controls.Add(liSpace); 
 
                cell.Controls.Add(new LiteralControl(((GridDataItem)item).GetDataKeyValue(columnUniqueName).ToString())); 
                cell.Style["height"] = "15px"; 
 
            } 
        } 
    } 
 
    protected void RadGrid1_PreRender(object sender, EventArgs e) 
    { 
 
        string ActualNodes = string.Empty; 
 
        foreach (GridDataItem dataItem in RadGrid1.Items) 
        { 
            if (dataItem.Visible) 
            { 
                ActualNodes += dataItem["EmployeeID"].Text + ","; 
            } 
        } 
 
 
        if (ActualNodes.Length > 0) 
            ActualNodesActualNodes = ActualNodes.Substring(0, ActualNodes.Length - 1); 
 
        RadGrid2.Controls.Clear(); 
        RadGrid2.DataSource = getDetails(ActualNodes); 
        RadGrid2.DataBind(); 
        //Response.Write("<script> alert(" + sTest + ");</script>");  
    } 
 
 
    void button_Click(object sender, EventArgs e) 
    { 
        ((Button)sender).CssClass = (((Button)sender).CssClass == "rgExpand") ? "rgCollapse" : "rgExpand"; 
        LblRadgrid1_height.Text = RadGrid1.Height.Value.ToString(); 
        //Response.Write("<script language='javascript'> document.alert(" + RadGrid1.Height.Value.ToString() + ");</script>"); 
    } 
 
 
    private void bindGrid2() 
    { 
 
        RadGrid2.Controls.Clear(); 
        string initialNodes = string.Empty; 
        for (int m = 0; m < RadGrid1.Items.Count; m++) 
        { 
            if (!RadGrid1.Items[m]["EmployeeID"].Text.ToLower().Equals("&nbsp;") && RadGrid1.Items[m].Visible) 
                initialNodes += RadGrid1.Items[m]["EmployeeID"].Text + ","; 
        } 
 
        if (initialNodes.Length > 0) 
        { 
            RadGrid2.DataSource = getEmployees(initialNodes.Substring(0, initialNodes.Length - 1)); 
        } 
        else 
            RadGrid2.DataSource = getEmployees(""); 
 
        RadGrid2.DataBind(); 
    } 
 
    private DataView getEmployees(string initialNodes) 
    { 
        DataSet ds = new DataSet(); 
 
        string sqlFinal = string.Empty; 
        if (!initialNodes.Equals(string.Empty)) 
        { 
            sqlFinal = "Where EmployeeID in (" + initialNodes + ")"; 
        } 
 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand("SELECT top 1 [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] " + sqlFinal, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
 
            sqlAdapter.Fill(ds); 
        } 
 
        DataView dv = new DataView(ds.Tables[0]); 
        return dv; 
    } 
 
    private DataTable getChildNodesByID(string ParentID) 
    { 
        DataSet ds = new DataSet(); 
        string sql = "SELECT [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] Where ReportsTo = " + ParentID; 
 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand(sql, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
            sqlAdapter.Fill(ds); 
        } 
 
        DataTable dt = new DataTable(); 
        if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0) 
            return ds.Tables[0]; 
        else 
            return null; 
    } 
 
    private DataView getDetails(string ActualNodes) 
    { 
        DataSet ds = new DataSet(); 
 
 
        //string noeuds = ActualNodes.Substring(0, ActualNodes.Length - 1);  
 
        string[] tabNoeuds = ActualNodes.Split(','); 
        string swhen = " CASE "
 
        for (int i = 0; i < tabNoeuds.Length; i++) 
        { 
            swhen += " WHEN EmployeeID = " + tabNoeuds[i] + " THEN " + (i + 1) + " "; 
        } 
        swhen += " END "; 
 
        string sql = "SELECT [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] Where EmployeeID in (" + ActualNodes + ")"; 
        sql += " ORDER BY " + swhen; 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand(sql, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
            sqlAdapter.Fill(ds); 
        } 
 
        DataView dv = new DataView(ds.Tables[0]); 
        return dv; 
    } 
 
 
 
    static private string GetConnectionString() 
    { 
        return "server=STATION00374;database=Northwind;Integrated Security=SSPI;"; 
    } 
 
 
    protected void RadGrid1_SelectedIndexChanged(object sender, EventArgs e) 
    { 
        if (Session["RadGrid1_SelectedValue"] != null) 
            Session.Remove("RadGrid1_SelectedValue"); 
 
        Session["RadGrid1_SelectedValue"] = RadGrid1.SelectedValue.ToString();  
    } 
 
    protected void RadGrid2_ItemUpdated(object source, Telerik.Web.UI.GridUpdatedEventArgs e) 
    { 
        string item = getItemName(e.Item.OwnerTableView.Name); 
        string field = getFieldName(e.Item.OwnerTableView.Name); 
        if (e.Exception != null) 
        { 
            e.KeepInEditMode = true
            e.ExceptionHandled = true
            DisplayMessage(item + " " + e.Item[field].Text + " cannot be updated. Reason: " + e.Exception.Message); 
        } 
        else 
        { 
            DisplayMessage(item + " " + e.Item[field].Text + " updated"); 
        } 
    } 
 
    private String getItemName(string tableName) 
    { 
        switch (tableName) 
        { 
            case ("Employees"): 
                { 
                    return "Employees"; 
                } 
            default: return ""; 
        } 
    } 
 
    private String getFieldName(string tableName) 
    { 
        switch (tableName) 
        { 
            case ("Employees"): 
                { 
                    return "EmployeeID"; 
                } 
            default: return ""; 
        } 
    } 
 
    private void DisplayMessage(string text) 
    { 
        RadGrid1.Controls.Add(new LiteralControl(string.Format("<span style='color:red'>{0}</span>", text))); 
    } 
 

3 Answers, 1 is accepted

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Tsvetoslav
Telerik team
answered on 05 Feb 2010, 08:37 AM
Hello RadTony,

You do need the NeedDataSource event or in other words Advanced binding for the second grid and remove the data-binding logic from the Page_PreRender and Page_PreRenderComplete events. You should find the following help article helpful as well:

http://www.telerik.com/help/aspnet-ajax/grdinsertupdatedeleteatdatabaselevel.html


Regards,
Tsvetoslav
the Telerik team

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RadTony
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answered on 05 Feb 2010, 10:36 AM
Tsvetoslav,

          I put "needDataSource" event, but I can't get rid of   "RadGrid1_PreRender" method in my code.
          
         RadGrid2's data must be synchronized with RadGrid1's data ... 

          And each time the user expands a row in RadGrid1, The PreRender method enables me to get the expanded Row's IDs and populate RadGrid2 in a given order (the same order as they appear in RadGrid1 and not the natural order in which they are in database)

          I paste my actual c# code. I removed databinding in Page_Load and Page_PreRenderComplete events.
May be I must do the binding of events (edit, update) in PreRender method for each row ? I can't edit any row actually.

using System; 
using System.Collections.Generic; 
using System.Linq; 
using System.Web; 
using System.Web.UI; 
using System.Web.UI.WebControls; 
using Telerik.Web.UI; 
using System.Reflection; 
using System.Data; 
using System.Data.SqlClient; 
 
public partial class RadGridMarche2 : System.Web.UI.Page 
{      
    
    protected void RadGrid2_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e) 
    { 
 
        try 
        { 
            string initialNodes = string.Empty; 
            string ActualNodes = string.Empty; 
            int counterVisibleNodes = 0
 
            // Initially when the page loads, see if RadGrid1 is populated 
            for (int m = 0; m < RadGrid1.Items.Count; m++) 
            { 
                if (!RadGrid1.Items[m]["EmployeeID"].Text.ToLower().Equals("&nbsp;") && RadGrid1.Items[m].Visible) 
                    initialNodes += RadGrid1.Items[m]["EmployeeID"].Text + ","; 
            } 
             
            foreach (GridDataItem dataItem in RadGrid1.Items) 
            { 
                if (dataItem.Visible) 
                { 
                    ActualNodes += dataItem["EmployeeID"].Text + ","; 
                    counterVisibleNodes++; 
                } 
            } 
 
            // Priority to Actual nodes (when one of RadGrid1's rows gets expanded ...)  
            if (ActualNodes.Length > 0) 
            { 
                ActualNodesActualNodes = ActualNodes.Substring(0, ActualNodes.Length - 1); 
 
                RadGrid2.Controls.Clear(); 
                RadGrid2.DataSource = getDetails(ActualNodes); 
                //RadGrid2.DataBind(); 
            } 
            else if (ActualNodes.Length == 0 && initialNodes.Length > 0) // then priority to initialNodes (if there are no actual nodes) 
            { 
                RadGrid2.DataSource = getEmployees(initialNodes.Substring(0, initialNodes.Length - 1)); 
            } 
            else // if no nodes ... this must not occur ... 
                RadGrid2.DataSource = null
 
 
            // if a row is selected in RadGrid1, then select the same row in RadGrid2 
            if (Session["RadGrid1_SelectedValue"] != null) 
            { 
                for (int m = 0; m < RadGrid2.Items.Count; m++) 
                { 
                    if (RadGrid2.Items[m]["EmployeeID"].Text.Equals(Session["RadGrid1_SelectedValue"].ToString())) 
                    { 
                        RadGrid2.Items[m].Selected = true
                        break; 
                    } 
                } 
                Session.Remove("RadGrid1_SelectedValue"); 
            } 
 
        } 
        finally 
        { 
            //Close the SqlConnection      
            SqlConnection.Close(); 
        } 
 
    }  
 
    public void Page_Load(object sender, EventArgs e) 
    { 
        //bindGrid2(); 
        
        if (Assembly.GetAssembly(typeof(ScriptManager)).FullName.IndexOf("3.5") != -1) 
        { 
            RadGrid1.MasterTableView.FilterExpression = @"it[""ReportsTo""] = Convert.DBNull"; 
        } 
        else 
        { 
            RadGrid1.MasterTableView.FilterExpression = "ReportsTo IS NULL"
        } 
         
        if (RadGrid1.MasterTableView.DetailTables != null) 
        { 
            RadGrid1.MasterTableView.DetailTables[0].AlternatingItemStyle.BackColor = System.Drawing.Color.Azure  ; 
            RadGrid1.MasterTableView.DetailTables[0].ItemStyle.BackColor = System.Drawing.Color.BlanchedAlmond; 
 
            if (RadGrid1.MasterTableView.DetailTables[0].DetailTables[0] != null) 
            { 
                RadGrid1.MasterTableView.DetailTables[0].DetailTables[0].AlternatingItemStyle.BackColor = System.Drawing.Color.Azure; 
                RadGrid1.MasterTableView.DetailTables[0].DetailTables[0].ItemStyle.BackColor = System.Drawing.Color.BlanchedAlmond; 
            } 
        } 
         
 
    } 
 
    public void Page_PreRenderComplete(object sender, EventArgs e) 
    { 
        HideExpandColumnRecursive(RadGrid1.MasterTableView);   
    } 
 
    public void HideExpandColumnRecursive(GridTableView tableView) 
    { 
        GridItem[] nestedViewItems = tableView.GetItems(GridItemType.NestedView); 
        foreach (GridNestedViewItem nestedViewItem in nestedViewItems) 
        { 
            foreach (GridTableView nestedView in nestedViewItem.NestedTableViews) 
            { 
                nestedView.Style["border"] = "0"; 
 
                Button MyExpandCollapseButton = (Button)nestedView.ParentItem.FindControl("MyExpandCollapseButton"); 
                if (nestedView.Items.Count == 0) 
                { 
                    if (MyExpandCollapseButton != null) 
                    { 
                        MyExpandCollapseButton.Style["visibility"] = "hidden"; 
                    } 
                    nestedViewItem.Visible = false
                } 
                else 
                { 
                    if (MyExpandCollapseButton != null) 
                    { 
                        MyExpandCollapseButton.Style.Remove("visibility"); 
                    } 
                } 
 
                if (nestedView.HasDetailTables) 
                { 
                    HideExpandColumnRecursive(nestedView); 
                } 
            } 
        } 
    } 
 
    protected void RadGrid1_ItemCreated(object sender, GridItemEventArgs e) 
    { 
        CreateExpandCollapseButton(e.Item, "EmployeeID"); 
 
        if (e.Item is GridHeaderItem && e.Item.OwnerTableView != RadGrid1.MasterTableView) 
        { 
            e.Item.Style["display"] = "none"; 
        } 
 
        if (e.Item is GridNestedViewItem) 
        { 
            e.Item.Cells[0].Visible = false
 
            Table table = (Table)e.Item.OwnerTableView.Controls[0]; 
 
            GridItem prevItem = (GridItem)table.Rows[table.Rows.Count - 1]; 
            // Why -3? We need to skip the NestedViewItem and the preceding DataItem's invisible EditItem 
 
            if (prevItem.ItemType == GridItemType.AlternatingItem) 
            { 
                e.Item.CssClass = "DetailAltRow"
            } 
            else 
            { 
                e.Item.CssClass = "DetailRow"
            } 
            /* 
            e.Item.Cells[0].CssClass = "DetailRowCell"
            e.Item.Cells[1].CssClass = "DetailRowCell"
             */ 
        } 
 
    
    } 
 
    protected void RadGrid1_ColumnCreated(object sender, GridColumnCreatedEventArgs e) 
    { 
        if (e.Column is GridExpandColumn) 
        { 
            e.Column.Visible = false
        } 
        else if (e.Column is GridBoundColumn) 
        { 
            e.Column.HeaderStyle.Width = Unit.Pixel(100); 
        } 
    } 
 
    protected void RadGrid1_ItemDataBound(object sender, GridItemEventArgs e) 
    { 
        CreateExpandCollapseButton(e.Item, "EmployeeID"); 
    } 
 
    public void CreateExpandCollapseButton(GridItem item, string columnUniqueName) 
    { 
        if (item is GridDataItem) 
        { 
            if (item.FindControl("MyExpandCollapseButton") == null) 
            { 
                Button button = new Button(); 
                button.Click += new EventHandler(button_Click); 
                button.CommandName = "ExpandCollapse"
                button.CssClass = (item.Expanded) ? "rgCollapse" : "rgExpand"; 
                button.ID = "MyExpandCollapseButton"
 
                if (item.OwnerTableView.HierarchyLoadMode == GridChildLoadMode.Client) 
                { 
                    string script = String.Format(@"$find(""{0}"")._toggleExpand(this, event); return false;", item.Parent.Parent.ClientID); 
 
                    button.OnClientClick = script
                } 
 
                int level = item.ItemIndexHierarchical.Split(':').Length; 
                if (level > 1) 
                { 
                    button.Style["margin-left"] = level + 10 + "px"; 
                    button.Style["height"] = "15px"; 
                } 
 
 
                TableCell cell = ((GridDataItem)item)[columnUniqueName]; 
                cell.Controls.Add(button); 
 
                LiteralControl liSpace = new LiteralControl("&nbsp;"); 
                cell.Controls.Add(liSpace); 
 
                cell.Controls.Add(new LiteralControl(((GridDataItem)item).GetDataKeyValue(columnUniqueName).ToString())); 
                cell.Style["height"] = "15px"; 
 
            } 
        } 
    } 
 
    protected void RadGrid1_PreRender(object sender, EventArgs e) 
    { 
         
        string ActualNodes = string.Empty; 
 
        foreach (GridDataItem dataItem in RadGrid1.Items) 
        { 
            if (dataItem.Visible) 
            { 
                ActualNodes += dataItem["EmployeeID"].Text + ","; 
            } 
        } 
 
 
        if (ActualNodes.Length > 0) 
            ActualNodesActualNodes = ActualNodes.Substring(0, ActualNodes.Length - 1); 
 
        RadGrid2.Controls.Clear(); 
        RadGrid2.DataSource = getDetails(ActualNodes); 
        RadGrid2.DataBind(); 
        //Response.Write("<script> alert(" + sTest + ");</script>");  
          
    } 
 
 
    void button_Click(object sender, EventArgs e) 
    { 
        ((Button)sender).CssClass = (((Button)sender).CssClass == "rgExpand") ? "rgCollapse" : "rgExpand"; 
        LblRadgrid1_height.Text = RadGrid1.Height.Value.ToString(); 
        //Response.Write("<script language='javascript'> document.alert(" + RadGrid1.Height.Value.ToString() + ");</script>"); 
    } 
 
 
    
    private DataView getEmployees(string initialNodes) 
    { 
        DataSet ds = new DataSet(); 
 
        string sqlFinal = string.Empty; 
        if (!initialNodes.Equals(string.Empty)) 
        { 
            sqlFinal = "Where EmployeeID in (" + initialNodes + ")"; 
        } 
 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand("SELECT top 1 [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] " + sqlFinal, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
 
            sqlAdapter.Fill(ds); 
        } 
 
        DataView dv = new DataView(ds.Tables[0]); 
        return dv; 
    } 
 
    private DataTable getChildNodesByID(string ParentID) 
    { 
        DataSet ds = new DataSet(); 
        string sql = "SELECT [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] Where ReportsTo = " + ParentID; 
 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand(sql, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
            sqlAdapter.Fill(ds); 
        } 
 
        DataTable dt = new DataTable(); 
        if (ds != null && ds.Tables.Count > 0 && ds.Tables[0].Rows.Count > 0) 
            return ds.Tables[0]; 
        else 
            return null; 
    } 
 
    private DataView getDetails(string ActualNodes) 
    { 
        DataSet ds = new DataSet(); 
 
 
        //string noeuds = ActualNodes.Substring(0, ActualNodes.Length - 1);  
 
        string[] tabNoeuds = ActualNodes.Split(','); 
        string swhen = " CASE "
 
        for (int i = 0; i < tabNoeuds.Length; i++) 
        { 
            swhen += " WHEN EmployeeID = " + tabNoeuds[i] + " THEN " + (i + 1) + " "; 
        } 
        swhen += " END "; 
 
        string sql = "SELECT [EmployeeID], [LastName], [FirstName], [Title], [ReportsTo] FROM [Employees] Where EmployeeID in (" + ActualNodes + ")"; 
        sql += " ORDER BY " + swhen; 
        using (SqlConnection conn = new SqlConnection()) 
        { 
            conn.ConnectionString = GetConnectionString(); 
            SqlCommand cmd = new SqlCommand(sql, conn); 
            conn.Open(); 
 
            SqlDataAdapter sqlAdapter = new SqlDataAdapter(cmd); 
            sqlAdapter.Fill(ds); 
        } 
 
        DataView dv = new DataView(ds.Tables[0]); 
        return dv; 
    } 
 
 
 
    static private string GetConnectionString() 
    { 
        return "server=STATION00374;database=Northwind;Integrated Security=SSPI;"; 
    } 
 
 
    protected void RadGrid1_SelectedIndexChanged(object sender, EventArgs e) 
    { 
        if (Session["RadGrid1_SelectedValue"] != null) 
            Session.Remove("RadGrid1_SelectedValue"); 
 
        Session["RadGrid1_SelectedValue"] = RadGrid1.SelectedValue.ToString();  
    } 
 
    protected void RadGrid2_ItemUpdated(object source, Telerik.Web.UI.GridUpdatedEventArgs e) 
    { 
        string item = getItemName(e.Item.OwnerTableView.Name); 
        string field = getFieldName(e.Item.OwnerTableView.Name); 
        if (e.Exception != null) 
        { 
            e.KeepInEditMode = true
            e.ExceptionHandled = true
            DisplayMessage(item + " " + e.Item[field].Text + " cannot be updated. Reason: " + e.Exception.Message); 
        } 
        else 
        { 
            DisplayMessage(item + " " + e.Item[field].Text + " updated"); 
        } 
    } 
 
    private String getItemName(string tableName) 
    { 
        switch (tableName) 
        { 
            case ("Employees"): 
                { 
                    return "Employees"; 
                } 
            default: return ""; 
        } 
    } 
 
    private String getFieldName(string tableName) 
    { 
        switch (tableName) 
        { 
            case ("Employees"): 
                { 
                    return "EmployeeID"; 
                } 
            default: return ""; 
        } 
    } 
 
    private void DisplayMessage(string text) 
    { 
        RadGrid1.Controls.Add(new LiteralControl(string.Format("<span style='color:red'>{0}</span>", text))); 
    } 
 

0
Tsvetoslav
Telerik team
answered on 10 Feb 2010, 03:17 PM
Hello RadTony,

I'd recommend that you use the NeedDataSource event for both grids. And if you need any modification to the second grid's data after the first one is data-bound you can use RadGrid1's OnDataBound event.

I hope this helps.

Best wishes,
Tsvetoslav
the Telerik team

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