Read-only column on GridView Row Editing

Here's how to make a specific gridview column read only when a gridview row editing event has been triggered.
See RowCreated event on making a gridview column read only.

vb.net Code:

Protected Sub gvDetails_RowCreated(sender As Object, e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles gvDetails.RowCreated
        For Each cell As TableCell In e.Row.Cells
            If ((Not String.IsNullOrEmpty(cell.Text)) And (cell.Text <> "&nbsp;")) Then
                Dim fld As BoundField
                fld = DirectCast(DirectCast(cell, DataControlFieldCell).ContainingField, BoundField)
                If fld.DataField = "CustomerID" Then
                    fld.ReadOnly = True
                End If
            End If
        Next
    End Sub

KGC

Sample Code: ASP.NET in VB
- VS 2010
- ADO.NET Entity Framework
- Northwinds Database