VB.NET Syntax (Toggle Plain Text)
Private Sub ChangeBackcolorRed(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.Enter, TextBox2.Enter, TextBox3.Enter
sender.backcolor = Color.Blue
End Sub
Private Sub ChangeBackcolorWhite(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles TextBox1.Leave, TextBox2.Leave, TextBox3.Leave
sender.backcolor = Color.White
End Sub