[amgadtamer]

كود :

If Microsoft.VisualBasic.Left(Val(Me.TextBox1.Text), 2) = 71 Then
            If Len(Me.TextBox1.Text) = 9 Then
                Dim txtval As String = Val(Microsoft.VisualBasic.Right(Me.TextBox1.Text, 4) * 2) + 2998
                Me.TextBox2.Text = Microsoft.VisualBasic.Left(txtval, 4)

            End If
        End If