Kod:
Protected Sub TxtId_TextChanged(sender As Object, e As EventArgs)
Dim currentRow As GridViewRow = DirectCast(DirectCast(sender, TextBox).Parent.Parent.Parent.Parent, GridViewRow)
Dim txt As TextBox = DirectCast(currentRow.FindControl("TxtId"), TextBox)
'1.kolondaki Textbox
Dim txt2 As TextBox = DirectCast(currentRow.FindControl("Txt2"), TextBox)
'2.kolondaki Textbox
If txt.Text.Length > 2 Then
MyBeep(1000, 1500)
txt2.Focus()
End If
End Sub