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Rebinding Grid From Within User Control Form

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Shawn asked on 03 Jun 2009, 02:12 PM
I have an application that uses a formview within the Grid's NestedViewTemplate to display additional record data:
<telerik:RadGrid ID="grid_applications" runat="server"  
    <asp:Label ID="GridRec" runat="server" Visible="false" Text='<%# Eval("record") %>' /> 
       <uc1:AppViewer ID="AppViewer1" runat="server" /> 

Inside the UserControl I have a FormView to display all the additional data.  All of this works fine.

However, I have a RadComboBox that I use to perform an update of status when the user selects something.  This column is found on the main grid so when they make a change I want the main grid to display the new value immediately, I cant get it to work.  I thought I could just rebind the main grid like so:
Protected Sub list_appState_SelectedIndexChanged(ByVal o As ObjectByVal e As Telerik.Web.UI.RadComboBoxSelectedIndexChangedEventArgs) 
        Dim record As Integer = (TryCast(Parent.FindControl("GridRec"), Label)).Text 
        Dim AppState As String = (TryCast(formview_AppInfo.FindControl("list_appState"), RadComboBox)).SelectedValue 
        Dim UpdateSuccess As Integer = Apps.UpdateAppState(record, AppState) 
        If UpdateSuccess > 0 Then 
            lbl_status.Text = String.Format("<br />The Application Status has been updated to '{0}' for record: {1}.<br /><br />", AppState, record) 
            Dim grid As RadGrid = (TryCast(Parent.FindControl("grid_applications"), RadGrid)) 
        End If 
    End Sub 

However on that rebind I get the error:

Object reference not set to an instance of an object.

Should I not be able to reference the grid just as I do other controls on the parent and then rebind it?

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answered on 05 Jun 2009, 01:36 PM
Hi Shawn,

You can use the NamingContainer object of the combo box to get a reference to the RadGrid control. For example, if the combo box is within an edit form of the grid, the code for accessing the latter becomes as follows:

Dim grid As RadGrid = TryCast(DirectCast(DirectCast(sender, RadComboBox).NamingContainer, GridEditFormItem).OwnerTableView.OwnerGrid, RadGrid) 

I hope this helps.

All the best,
the Telerik team

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