Hacer una calculadora en Visual Basic .NET 2013

Vídeo acerca de cómo hacer una calculadora sencilla en Visual Basic .NET 2013 (Versión Express). Aquí debajo coloco las líneas de programación por sí quieren copiar algunas: Dim Operacion As String Dim ValorResultado As Nullable(Of Double) = Nothing Dim Valor2 As Nullable(Of Double) = Nothing Dim SePresionaOperador As Boolean Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "1" End Sub Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "2" End Sub Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "3" End Sub Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "4" End Sub Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "5" End Sub Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "6" End Sub Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "7" End Sub Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "8" End Sub Private Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "9" End Sub Private Sub Button0_Click(sender As Object, e As EventArgs) Handles Button0.Click EvaluaRestriccionesParaConcatenar() TxtResultado.Text &= "0" End Sub Private Sub ButtonPunto_Click(sender As Object, e As EventArgs) Handles ButtonPunto.Click EvaluaRestriccionesParaConcatenar() If InStr(TxtResultado.Text, ".", CompareMethod.Text) = 0 Then TxtResultado.Text &= "." End If End Sub Private Sub ButtonSuma_Click(sender As Object, e As EventArgs) Handles ButtonSuma.Click EvaluayHazOperacion() Operacion = "+" End Sub Private Sub ButtonResta_Click(sender As Object, e As EventArgs) Handles ButtonResta.Click EvaluayHazOperacion() Operacion = "-" End Sub Private Sub ButtonMultiplicacion_Click(sender As Object, e As EventArgs) Handles ButtonMultiplicacion.Click EvaluayHazOperacion() Operacion = "*" End Sub Private Sub ButtonDivison_Click(sender As Object, e As EventArgs) Handles ButtonDivison.Click EvaluayHazOperacion() Operacion = "/" End Sub Private Sub ButtonBorrar_Click(sender As Object, e As EventArgs) Handles ButtonBorrar.Click TxtResultado.Text = "0" Valor2 = Nothing ValorResultado = Nothing End Sub Private Sub ButtonIgual_Click(sender As Object, e As EventArgs) Handles ButtonIgual.Click EvaluayHazOperacion() Operacion = "" End Sub Public Sub EvaluayHazOperacion() SePresionaOperador = True Valor2 = Val(TxtResultado.Text) If ValorResultado IsNot Nothing Then Select Case Operacion Case "+" ValorResultado = ValorResultado + Valor2 Case "-" ValorResultado -= Valor2 Case "*" ValorResultado *= Valor2 Case "/" ValorResultado /= Valor2 End Select TxtResultado.Text = ValorResultado Else ValorResultado = Valor2 End If End Sub Public Sub EvaluaRestriccionesParaConcatenar() If SePresionaOperador = True Then TxtResultado.Text = "" SePresionaOperador = False ElseIf TxtResultado.Text = "0" Then TxtResultado.Text = "" End If End Sub