Hi,

We are using telerik Rad Ajax Controls for our website, Technologies, ASP.NET, C#.  We are using Visual Studio 2010 and framework 4.0 for our web application development. 

Scenario is as follows,

1.         protected void gv_Movie_RowCommand(object sender, GridViewCommandEventArgs e)
2.         {
3.             //get the row number of the selected row
4.     // The error is at line 5
5.             int rowNo = int.Parse(e.CommandArgument.ToString());
6.             //get the selected row
7.             GridViewRow row = gv_movie.Rows[rowNo];
9.             //Get movie ID, which is on the 1st column of the gridview
11.             string movieID = row.Cells[0].Text;
12.             if (e.CommandName == "Select")
13.             {
14.                 Response.Redirect("");
15.             }
16.             else if (e.CommandName == "Update")
17.             {
18.                 Response.Redirect("");
19.             }
20.         }

<telerik:RadGrid ID="grdPaymentHistory" runat="server" AutoGenerateColumns="False"  

 <ExpandCollapseColumn>

 <HeaderStyle Width="15px"></HeaderStyle>  

 <telerik:GridBoundColumn DataField="FinancialTransactionId" UniqueName="FinancialTransactionId"   

 <telerik:GridBoundColumn HeaderText="Amount" DataField="Amount" UniqueName="Amount"

 SortExpression="Amount" DataFormatString="{0:C}" Aggregate="Custom">

 <ItemStyle HorizontalAlign="Right" />

 <FooterStyle HorizontalAlign="Right" />

 </telerik:GridBoundColumn>

 <telerik:GridEditCommandColumn UniqueName="EditRefundAmount" />

 <telerik:GridBoundColumn HeaderText="GL Acct" DataField="GLAccountId" UniqueName="GLAccountId"

 SortExpression="GLAccountId" />  

 SortExpression="AuthorizationNumber" /> 

 <telerik:GridBoundColumn HeaderText="User" DataField="CreatedBy" SortExpression="CreatedBy"

 UniqueName="CreatedBy" />  

 <telerik:GridTemplateColumn> 

 <asp:Image ID="imgReceipt" runat="server" ImageUrl="~/App_Themes/Default/images/receipt.png"

 ToolTip="View receipt details for printing and emailing" />

 </ItemTemplate>

 <FooterStyle HorizontalAlign="Right"></FooterStyle>  

 </FormTemplate>

 </EditFormSettings> 

<GroupingSettings CaseSensitive="False" />

<ClientSettings AllowColumnsReorder="false" ReorderColumnsOnClient="True">

<Resizing AllowColumnResize="true" ResizeGridOnColumnResize="false" ClipCellContentOnResize="true" />

 <Scrolling AllowScroll="true" UseStaticHeaders="True" />

</telerik:RadGrid>
The update command event is as below:
 protected void grdPaymentHistory_UpdateCommand(object sender, GridCommandEventArgs e)
        {  

            //Get the GridEditableItem of the RadGrid
            GridEditableItem editedItem = e.Item as GridEditableItem;

            //Access the textbox from the edit form template and store the values in variables.
            if (editedItem != null)
            {
                var refundAmount = ((RadTextBox)editedItem.FindControl("txtAmount")).Text;
            }
        }

<telerik:GridEditCommandColumn HeaderStyle-Width="60px" UniqueName="EditCommandColumn"

Visible="true" ButtonType="ImageButton" HeaderText="Edit">

</telerik:GridEditCommandColumn>

Hope I am clear  with my question.

Aprreciate your help.

Thanks