How do I loop around a RadGrid to retrieve entered values

[wonderbison]

Hi

I may be doing this wrong but I have a programatically created hierarchical grid. How do I loop around each row and column to retrieve values when Button1 is clicked? I am especially interested in values that have changed.

Thanks

<%@ Page Title="Home Page" Language="C#" AutoEventWireup="true"
    CodeBehind="Default.aspx.cs" Inherits="DataFormatting._Default" %>

<%@ Register assembly="Telerik.Web.UI" namespace="Telerik.Web.UI" tagprefix="telerik" %>


<form id="form1" runat="server">
<telerik:RadAjaxManager ID="RadAjaxManager1" runat="server">
</telerik:RadAjaxManager>
<telerik:RadScriptManager ID="RadScriptManager1" Runat="server">
</telerik:RadScriptManager>
    <asp:Button ID="Button1" runat="server" onclick="Button1_Click"
    Text="Loop The Grid" Width="235px" />
    <div class="myRadGrid" >
        <asp:PlaceHolder ID="PlaceHolder1" runat="server" >

        <telerik:RadGrid ID="myRadGrid" runat="server"
            onitemdatabound="myRadGrid_ItemDataBound" onprerender="myRadGrid_PreRender" >
        </telerik:RadGrid>
        <telerik:GridTextBoxColumnEditor runat="server" ID="MyEditor">
            <TextBoxStyle Width="35px" />
        </telerik:GridTextBoxColumnEditor>
        </asp:PlaceHolder>
    </div>

</form>

using System;
using System.Collections.Generic;
using System.Data;
using System.Linq;
using System.Diagnostics;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using Telerik.Web.UI;

namespace DataFormatting
{
    public partial class _Default : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (!this.IsPostBack)
            {
                BuildTheGrid();
            }

        }
        protected void myRadGrid_ItemDataBound(object sender, GridItemEventArgs e)
        {
        }
        #region Build the grid

        protected void myRadGrid_PreRender(object sender, System.EventArgs e)
        {
            bool itemsUpdated = false;
            foreach (GridItem item in myRadGrid.MasterTableView.Items)
            {
                if (item is GridEditableItem)
                {
                    itemsUpdated = true;

                    GridEditableItem editableItem = item as GridDataItem;
                    editableItem.Edit = true;
                }
            }
            if (itemsUpdated)
                myRadGrid.Rebind();
        }
        private DataSet BuildTheGrid()
        {
            try
            {

                myRadGrid.DataSource = null;
                DataSet myDataToShow = LoadGridData();


                // Define the main grid
                for (int loopPos = myRadGrid.MasterTableView.Columns.Count; loopPos > 0; loopPos--)
                {
                    myRadGrid.MasterTableView.Columns.RemoveAt(loopPos - 1);
                }
                myRadGrid.ID = "MyGrid";
                myRadGrid.DataSource = myDataToShow;
                myRadGrid.Width = Unit.Percentage(98);
                myRadGrid.AutoGenerateColumns = false;
                myRadGrid.ShowStatusBar = true;
                myRadGrid.GroupingEnabled = true;
                myRadGrid.MasterTableView.Width = Unit.Percentage(100);

                // now build the hierarchical grid
                GridGroupByExpression groupExpression = new GridGroupByExpression();
                myRadGrid.MasterTableView.GroupByExpressions.Add(new GridGroupByExpression("GroupValue1 group by GroupValue1"));
                myRadGrid.MasterTableView.GroupByExpressions.Add(new GridGroupByExpression("GroupValue2 group by GroupValue2"));

                myRadGrid.MasterTableView.ShowGroupFooter = true;
                myRadGrid.GroupingSettings.RetainGroupFootersVisibility = true;
                myRadGrid.AllowMultiRowEdit = true;
                myRadGrid.MasterTableView.EditMode = GridEditMode.InPlace;

                GridBoundColumn boundColumn = new GridBoundColumn();

                foreach (DataColumn col in myDataToShow.Tables[0].Columns)
                {
                    boundColumn = new GridBoundColumn();
                    myRadGrid.MasterTableView.Columns.Add(boundColumn);
                    boundColumn.DataField = col.ColumnName;
                    boundColumn.HeaderText = col.ColumnName;
                    boundColumn.Visible = true;
                    if (col.Ordinal > 1)
                    {
                        boundColumn.Aggregate = GridAggregateFunction.Sum;
                        boundColumn.FooterText = "";
                        boundColumn.DataFormatString = "{0:##,##0}";
                        boundColumn.ColumnEditorID = "MyEditor";
                        boundColumn.ReadOnly = false;
                    }

                }
                myRadGrid.DataBind();
            }
            catch (Exception exc)
            {
                Debug.WriteLine(exc.Message);
                return null;
            }
            finally
            {
            }
            return null;

        }
        #endregion

        #region Load the Grid Data
        private DataSet LoadGridData()
        {
            // return the data to display
            DataSet contributionData = new DataSet("MyData");

            DataTable gridData = contributionData.Tables.Add("ContData");

            gridData.Columns.Add(new DataColumn("GroupValue1"));
            gridData.Columns.Add(new DataColumn("GroupValue2"));
            DataColumn decCol = new DataColumn("ValueToSum");
            decCol.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(decCol);
            DataColumn perCol = new DataColumn("ValueToIgnore");
            perCol.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(perCol);
            DataColumn decCol2 = new DataColumn("ValueToSum2");
            decCol2.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(decCol2);
            DataColumn perCol2 = new DataColumn("ValueToIgnore2");
            perCol2.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(perCol2);
            DataColumn decCol3 = new DataColumn("ValueToSum3");
            decCol3.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(decCol3);
            DataColumn perCol3 = new DataColumn("ValueToIgnore3");
            perCol3.DataType = System.Type.GetType("System.Int32");
            gridData.Columns.Add(perCol3);


            for (int j = 1; j < 5; j++)
            {
                for (int i = 1; i < 5; i++)
                {
                    DataRow dataRow = contributionData.Tables[0].NewRow();

                    dataRow["GroupValue1"] = "Header 1 as " + j.ToString();
                    dataRow["GroupValue2"] = "Heading 2 as " + i.ToString();
                    dataRow["ValueToSum"] = 1234 * i * j;
                    dataRow["ValueToIgnore"] = 805 * i * j;
                    dataRow["ValueToSum2"] = 42 * i * j;
                    dataRow["ValueToIgnore2"] = 901 * i * j;
                    dataRow["ValueToSum3"] = 651 * i * j;
                    dataRow["ValueToIgnore3"] = 104 * i * j;

                    contributionData.Tables[0].Rows.Add(dataRow);
                }
            }
            return contributionData;
        }
        #endregion

        protected void Button1_Click(object sender, EventArgs e)
        {

        }

[Pavlina]

Hello Wonderbison,

For more information about how to loop through all detail tables/items in Telerik RadGrid you can refer to the help article below:
http://www.telerik.com/help/aspnet-ajax/grid-traversing-detail-tables-items-in-grid.html

To retrieve the newly entered values from the GridEditableItem upon update you can use ExtractValuesFromItem() method:
http://www.telerik.com/help/aspnet-ajax/grid-retrieve-original-values-for-edited-item.html

All the best,
Pavlina
the Telerik team

[wonderbison]

I did see those articles but the Traversing detail tables/items I cannot get to work which is why I posted.

So using the traversing method described, my "button" click method looks like the following however I get "Object reference not set to an instance of an object"

protected void Button1_Click(object sender, EventArgs e)
{
    GridTableView nestedTableView = (myRadGrid.MasterTableView.Items[0] as GridDataItem).ChildItem.NestedTableViews[0];
    foreach (GridNestedViewItem nestedViewItem in nestedTableView.GetItems(GridItemType.NestedView))
    {
        foreach (GridDataItem item in nestedViewItem.NestedTableViews[0].Items)
        {
            Console.WriteLine(item["ValueToSum"].Text.ToString());
        }
    }
}

[Pavlina]

Hello Wonderbison,

Please go throught the following help article and see if it helps:
http://www.telerik.com/help/aspnet-ajax/grid-extract-primary-key-for-parent-item-in-hierarchy-on-update-insert.html

Greetings,
Pavlina
the Telerik team