Programa Para Hacer Una Calculadora En Visual Basic

Public Class Form1
Public n1 As String
Public n2 As String
Public operador As String


Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles Button1.Click
TextBox1.Text = TextBox1.Text & 1
End Sub

Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.ClickTextBox1.Text = TextBox1.Text & 2
End Sub

Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click
TextBox1.Text =TextBox1.Text & 3
End Sub

Private Sub Button4_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button4.Click
TextBox1.Text = TextBox1.Text & 4
End SubPrivate Sub Button5_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button5.Click
TextBox1.Text = TextBox1.Text & 5
End Sub

Private Sub Button6_Click(ByValsender As System.Object, ByVal e As System.EventArgs) Handles Button6.Click
TextBox1.Text = TextBox1.Text & 6
End Sub

Private Sub Button7_Click(ByVal sender As System.Object,ByVal e As System.EventArgs) Handles Button7.Click
TextBox1.Text = TextBox1.Text & 7
End Sub

Private Sub Button8_Click(ByVal sender As System.Object, ByVal e As System.EventArgs)Handles Button8.Click
TextBox1.Text = TextBox1.Text & 8
End Sub

Private Sub Button9_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button9.ClickTextBox1.Text = TextBox1.Text & 9
End Sub

Private Sub Button10_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button10.Click
TextBox1.Text =TextBox1.Text & 0
End Sub

Private Sub Button15_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button15.Click
n1 = TextBox1.Text
TextBox1.Clear()...