I'm trying to validate my textbox so that the user must enter a Table Number between 1 and 20. The click event of the exit button checks this and if invalid input, displays a message box. It works for all numbers except 3-9 where it displays the warning even though it is in range. Anyone see where I'm going wrong?
Public Class Form1
Private Sub btnExit_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnExit.Click
If (txtTableNo.Text >= "1" And txtTableNo.Text <= "20") Then
Me.Close()
Else
MessageBox.Show("Table Number must be between 1-20", "Warning")
End If
End Sub
Private Sub txtTableNo_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtTableNo.KeyPress
If (e.KeyChar < "0" OrElse e.KeyChar > "9") _
AndAlso e.KeyChar <> ControlChars.Back Then
e.KeyChar = ""
Beep()
End If
End Sub
End Class
