Insert Columns Vs Edit Columns

[New User]

I currently have a radgrid with 6 columns.  When the user chooses to Edit the row they are able to edit columns 4-6.  If the user selects to insert a new row they may edit columns 1-6.  Can someone help me understand how to do this?

[Princy]

Hello,
 You can try the following code snippet to disable the columns in edit form.  

C#:

protected void RadGrid1_ItemCreated(object sender, Telerik.Web.UI.GridItemEventArgs e)
   {
       if (e.Item is GridEditFormItem && e.Item.IsInEditMode && !(e.Item is GridEditFormInsertItem) )
       {
           GridEditableItem editableitem = (GridEditableItem)e.Item;
           (editableitem["LastName"].Controls[0] as TextBox).Enabled = false;

       }
   }

Thanks,
Princy.