DataGridView. Handling selection changed event when column header is clicked

Question

I have some code in the selection changed event for my datagridview control.
It just gets the value in a particular cell in the current row and puts the value in a textbox.

Try
TxtOpNotes.Text = DataGridView1.CurrentRow.Cells(10).Value
Catch ex As Exception

            MsgBox(ex.ToString)
        End Try

However, the app throws an exception if the user clicks on the column header:

System.NullReferenceException: 'Object reference not set to an instance of an object.'

System.Windows.Forms.DataGridView.CurrentRow.get returned

I've tried

If DataGridView1.CurrentRow.Index = -1 Then
            Exit Sub
        End If

But I get the same exception.

Anyone know how to get out of this. It doesn't seem possible to disable the column header mouse click

Answer 1

Try adding this line: If DataGridView1.CurrentRow Is Nothing Then Exit Sub.