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[Solved] Is it possible to update a dynamic Grid ?

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Grid
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RadTony asked on 31 Mar 2010, 02:07 PM
Telerik experts,

       Here is my code. I can't update my dynamic RadGrid.
       Otherwise no problem to update a normally generated RadGrid.

       I must be missing something very basic ...
    
            <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Northwind2.aspx.cs" Inherits="Northwind2" %>    
        
            <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">    
        
            <html xmlns="http://www.w3.org/1999/xhtml">     
        
            <head runat="server">     
        
                <title>Northwind2</title>    
        
            </head>    
        
            <body>    
        
                <form id="form1" runat="server">     
        
                      <telerik:RadScriptManager ID="RadScriptManager1" runat="server" />    
        
                    <!-- content start -->    
        
                    <telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">     
        
                        <AjaxSettings>       
        
                            <telerik:AjaxSetting AjaxControlID="RadGrid2">        
        
                            </telerik:AjaxSetting>       
        
                        </AjaxSettings>       
        
                    </telerik:RadAjaxManager>    
        
                <div>    
        
                <br />    
        
                <asp:PlaceHolder ID="PlaceHolder1" runat="server" />    
        
                <br />    
        
                        <telerik:RadGrid ID="RadGrid2" EnableViewState="true" AllowAutomaticUpdates="True" OnUpdateCommand="grid_UpdateCommand"       
        
                            OnNeedDataSource="RadGrid2_NeedDataSource" Width="400px"    
        
                            runat="server" AutoGenerateColumns="false" AllowSorting="False" AllowMultiRowSelection="False" GridLines="None">                                    
        
                        <MasterTableView ItemStyle-Wrap="false" Name="Employees" ShowHeader="true" DataKeyNames="EmployeeID"      
        
                            EditMode="InPlace" BorderWidth="0" EnableColumnsViewState="true" Width="400px">                          
        
                            <HeaderStyle Wrap="false" Height="20px" Font-Size="X-Small" Font-Bold="true"/>                   
        
                            <AlternatingItemStyle Height="20px" BackColor="BlanchedAlmond" Wrap="false" BorderWidth="0" Font-Size="X-Small"/>        
        
                            <ItemStyle Height="20px" BackColor="Azure" Wrap="false" BorderWidth="0" Font-Size="X-Small"/>                
        
                            <EditItemStyle Height="20px" Wrap="false" BorderWidth="0" Font-Size="X-Small"/>          
        
                            <Columns>       
        
                                  <telerik:GridBoundColumn DataField="EmployeeID" HeaderText="EmployeeID" ItemStyle-Height="20px" ItemStyle-Width="150" ItemStyle-HorizontalAlign="Left" HeaderStyle-Width="150" HeaderStyle-HorizontalAlign="Center"></telerik:GridBoundColumn>                      
        
                                  <telerik:GridBoundColumn DataField="LastName" HeaderText="LastName" ItemStyle-Height="20px" ItemStyle-Width="150" ItemStyle-HorizontalAlign="Left" HeaderStyle-Width="150" HeaderStyle-HorizontalAlign="Center"></telerik:GridBoundColumn>                      
        
                                  <telerik:GridBoundColumn DataField="FirstName" HeaderText="FirstName" ItemStyle-Height="20px" ItemStyle-Width="150" ItemStyle-HorizontalAlign="Left" HeaderStyle-Width="150" HeaderStyle-HorizontalAlign="Center"></telerik:GridBoundColumn>                      
        
                                  <telerik:GridEditCommandColumn ></telerik:GridEditCommandColumn>    
        
                            </Columns>                                          
        
                        </MasterTableView>       
        
                        <clientsettings allowexpandcollapse="false">                       
        
                                <Scrolling AllowScroll="false" UseStaticHeaders="true"></Scrolling>                                                                                          
        
                        </clientsettings>        
        
                    </telerik:RadGrid>      
        
                </div>    
        
                </form>    
        
            </body>    
        
            </html>    
        
            '-------------------------------------------------------------     
        
            '-------------------------------------------------------------     
        
            '-------------------------------------------------------------     
        
            using System;     
        
            using System.Collections;     
        
            using System.Collections.Generic;     
        
            using System.Linq;     
        
            using System.Web;     
        
            using System.Web.UI;     
        
            using System.Web.UI.WebControls;     
        
            using System.Web.UI.HtmlControls;     
        
            using System.Data;     
        
            using System.Data.Sql;     
        
            using System.Data.SqlClient;     
        
            using Telerik.Web.UI;     
        
            using System.Reflection;     
        
            public partial class Northwind2 : System.Web.UI.Page     
        
            {       
        
                //Declare a global DataTable dtTable1            
        
                DataTable dtTable1 = new DataTable();     
        
                protected void Page_Load(object sender, EventArgs e)     
        
                {     
        
                }     
        
                protected void Page_Init(object sender, System.EventArgs e)     
        
                {     
        
                    PopulateGridOnPageInit();     
        
                }     
        
                protected void PopulateGridOnPageInit()     
        
                {            
        
                    RadGrid grid = new RadGrid();     
        
                    grid.ID = "grid";     
        
                    grid.Width = Unit.Pixel(400);     
        
                    grid.AllowSorting = true;     
        
                    grid.PagerStyle.Mode = GridPagerMode.NextPrevAndNumeric;     
        
                    grid.AllowPaging = true;     
        
                    grid.AllowAutomaticUpdates = false;     
        
                    grid.Skin = "Sunset";     
        
                    grid.MasterTableView.AutoGenerateColumns = false;     
        
                    grid.MasterTableView.EnableColumnsViewState = false;     
        
                    grid.MasterTableView.EditMode = GridEditMode.InPlace;     
        
                    grid.MasterTableView.EnableViewState=true ;     
        
                    grid.UpdateCommand +=new GridCommandEventHandler(grid_UpdateCommand);      
        
                    GridBoundColumn boundColumn;     
        
                    boundColumn = new GridBoundColumn();     
        
                    boundColumn.HeaderText = "EmployeeID";     
        
                    boundColumn.DataField = "EmployeeID";     
        
                    //boundColumn.UniqueName = "EmployeeID";     
        
                    grid.MasterTableView.Columns.Add(boundColumn);     
        
                    boundColumn = new GridBoundColumn();     
        
                    boundColumn.HeaderText = "LastName";     
        
                    boundColumn.DataField = "LastName";     
        
                    //boundColumn.UniqueName = "LastName";     
        
                    grid.MasterTableView.Columns.Add(boundColumn);     
        
                    boundColumn = new GridBoundColumn();     
        
                    boundColumn.HeaderText = "FirstName";     
        
                    boundColumn.DataField = "FirstName";     
        
                    //boundColumn.UniqueName = "FirstName";     
        
                    grid.MasterTableView.Columns.Add(boundColumn);     
        
                    GridEditCommandColumn gcEdit = new GridEditCommandColumn();     
        
                    grid.MasterTableView.Columns.Add(gcEdit);     
        
                    grid.DataSource = LoadData();     
        
                    grid.DataBind();     
        
                    PlaceHolder1.Controls.Add(grid);     
        
                }     
        
                protected void RadGrid2_NeedDataSource(object source, Telerik.Web.UI.GridNeedDataSourceEventArgs e)     
        
                {     
        
                    RadGrid2.DataSource = LoadData();     
        
                }     
        
                protected void grid_UpdateCommand(object source, Telerik.Web.UI.GridCommandEventArgs e)     
        
                {     
        
                    //Get the GridEditableItem of the RadGrid            
        
                    GridEditableItem eeeditedItem = e.Item as GridEditableItem;     
        
                    //Get the primary key value using the DataKeyValue.            
        
                    string EmployeeID = editedItem.OwnerTableView.DataKeyValues[editedItem.ItemIndex]["EmployeeID"].ToString();     
        
                    //Access the textbox from the edit form template and store the values in string variables.            
        
                    string LastName = (editedItem["LastName"].Controls[0] as TextBox).Text;     
        
                    string FirstName = (editedItem["FirstName"].Controls[0] as TextBox).Text;     
        
                    try     
        
                    {     
        
                        SqlConnection SqlConnection = new SqlConnection(GetConnectionString());     
        
                        SqlCommand SqlCommand1 = new SqlCommand();     
        
                        //Open the SqlConnection            
        
                        SqlConnection.Open();     
        
                        //Update Query to update the Datatable             
        
                        string updateQuery = " UPDATE Employees " +     
        
                                             " SET    LastName='" + LastName + "'," +     
        
                                             "        FirstName='" + FirstName + "'" +      
        
                                             " WHERE  EmployeeID=" + EmployeeID ;     
        
                        SqlCommand1.CommandText = updateQuery;     
        
                        SqlCommand1.Connection = SqlConnection;     
        
                        SqlCommand1.ExecuteNonQuery();     
        
                        //Close the SqlConnection            
        
                        SqlConnection.Close();     
        
                    }     
        
                    catch (Exception ex)     
        
                    {     
        
                        RadGrid2.Controls.Add(new LiteralControl("Unable to update Employee. Reason: " + ex.Message));     
        
                        e.Canceled = true;     
        
                    }     
        
                    finally     
        
                    {     
        
                        RadGrid2.EditIndexes.Clear();     
        
                    }     
        
                }     
        
                protected DataTable LoadData()     
        
                {     
        
                    string connectionString = GetConnectionString();     
        
                    SqlConnection SqlConnection = new SqlConnection(connectionString);     
        
                    DataTable dtTable = new DataTable();     
        
                    //Declare a global SqlDataAdapter SqlDataAdapter1            
        
                    SqlDataAdapter SqlDataAdapter1 = new SqlDataAdapter();     
        
                    //Declare a global SqlCommand SqlCommand            
        
                    SqlCommand SqlCommand1 = new SqlCommand();     
        
                    //Open the SqlConnection            
        
                    SqlConnection.Open();     
        
                    try     
        
                    {     
        
                        //Select Query to populate the RadGrid with data from table Employees.            
        
                        string selectQuery = "SELECT EmployeeID, LastName, FirstName, Title, ReportsTo from Employees";     
        
                        SqlDataAdapter1.SelectCommand = new SqlCommand(selectQuery, SqlConnection);     
        
                        SqlDataAdapter1.Fill(dtTable);     
        
                        return dtTable;     
        
                    }     
        
                    finally     
        
                    {     
        
                        //Close the SqlConnection            
        
                        SqlConnection.Close();     
        
                    }      
        
                }     
        
                static private string GetConnectionString()     
        
                {     
        
                    return "server=STATION00374;database=Northwind;Integrated Security=SSPI;";     
        
                }       
        
            }
1 Answer, 1 is accepted

answered on 02 Apr 2010, 01:23 PM
Hi Anthony,

Instead of binding the dynamic grid conditionally using simple binding with DataBind() calls, you should transform your code to take advantage of the advanced binding with NeedDataSource handling:
http://www.telerik.com/help/aspnet-ajax/grdadvanceddatabinding.html

Please, give this suggestion a try and let me know about the result.

Kind regards,
Pavlina
the Telerik team
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