[الطالب]

سلام


1:

كود :

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
   If IsNumeric(TextBox1.Text) Then
       TextBox2.Text = Val(TextBox1.Text) * 12
   Else
       MsgBox("تاكد من الرقم")
   End If
End Sub

2:

كود :

Private Sub TextBox1_KeyPress(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles TextBox1.KeyPress
   If Not (Char.IsControl(e.KeyChar) Or Char.IsDigit(e.KeyChar)) Then e.Handled = True
End Sub

موفقين