Error "Cannot find a cell bound to column name" when updatecommand is called

[Venkatesh]

HI,
I have the rad grid in which i have the edit item template. The aspx is as follows:

<telerik:RadGrid ID="radgrid1" runat="server"
        EnableViewState="true" ShowStatusBar="true" AllowAutomaticUpdates="false"
        ShowFooter="True"
        OnInsertCommand="radgrid1_InsertCommand" OnUpdateCommand="radgrid1_UpdateCommand"
        OnNeedDataSource="radgrid1_NeedDataSource"  >
        <MasterTableView DataKeyNames="ProductNumber" AutoGenerateColumns="false" EditMode="InPlace"
            CommandItemDisplay="TopAndBottom" CommandItemSettings-AddNewRecordText="Add New Purchase Order">
            <Columns>
                <telerik:GridEditCommandColumn ButtonType="ImageButton">
                </telerik:GridEditCommandColumn>
                <telerik:GridButtonColumn ConfirmText="Delete this product?" ConfirmDialogType="RadWindow"
                    ConfirmTitle="Delete" ButtonType="ImageButton" CommandName="Delete" ConfirmDialogHeight="100px"
                    ConfirmDialogWidth="220px">
                </telerik:GridButtonColumn>

<telerik:GridTemplateColumn DataField="ProductNumber" HeaderText="Product Number" UniqueName="ProductNumber"
                    Visible="true">
                    <InsertItemTemplate>
                        <telerik:RadTextBox ID="RadtxtPrdNumber" runat="server" Text="">
                        </telerik:RadTextBox>
                    </InsertItemTemplate>

<EditItemTemplate>
<telerik:RadTextBox ID="RadtxtPrdNumber" runat="server" Text='<%# Eval("ProductNumber") %>'>
</telerik:RadTextBox>
</EditItemTemplate>

                    <ItemTemplate>
<telerik:RadTextBox ID="RadtxtPrdNumber" ReadOnly="true" runat="server" Text='<%# Eval("ProductNumber") %>' />
                    </ItemTemplate>
                </telerik:GridTemplateColumn>

In the update command, i am trying to access the column as below:

GridEditableItem editedItem = e.Item as GridEditableItem;
               //Get the primary key value using the DataKeyValue.
               string ProductID = editedItem.OwnerTableView.DataKeyValues[editedItem.ItemIndex]["ProductNumber"].ToString();
               //Access the textbox from the edit form template and store the values in string variables.
               string strProductNumbervalue = (editedItem["RadtxtPrdNumber"].Controls[0] as RadTextBox).Text;

I am getting the error as "Cannot find a cell bound to column name 'RadtxtPrdNumber', when the code hits "string strProductNumbervalue".
How to fix this?
Thanks

[Shinu]

Hi,

You can try the following approach to access boundcolumns and templatecolumns.
C#:

protected void RadGrid2_UpdateCommand(object sender, GridCommandEventArgs e)
{
  GridEditableItem editedItem = (GridEditableItem)e.Item;
  TextBox txt = (TextBox)editedItem["Uniquename"].Controls[0];//accessing boundcolumns
  RadTextBox radtxt = (RadTextBox)editedItem.FindControl("RadtxtPrdNumber");//accessing controls in template columns
}

Thanks,
Shinu.