Public Class Form1
    Private Sub Label1_Click(sender As Object, e As EventArgs) Handles Label1.Click

    End Sub

    Private Sub Button3_Click(sender As Object, e As EventArgs) Handles Button3.Click
        TextBox1.Text = ""
        Label2.Text = ""
    End Sub

    Private Sub Label3_Click(sender As Object, e As EventArgs) Handles Label3.Click

    End Sub

    Private Sub Button5_Click(sender As Object, e As EventArgs) Handles Button5.Click
        TextBox1.Text = TextBox1.Text + "1"
    End Sub

    Private Sub Button6_Click(sender As Object, e As EventArgs) Handles Button6.Click
        TextBox1.Text = TextBox1.Text + "2"
    End Sub

    Private Sub Button7_Click(sender As Object, e As EventArgs) Handles Button7.Click
        TextBox1.Text = TextBox1.Text + "3"
    End Sub

    Private Sub Button8_Click(sender As Object, e As EventArgs) Handles Button8.Click
        TextBox1.Text = TextBox1.Text + "4"
    End Sub

    Private Sub Button9_Click(sender As Object, e As EventArgs) Handles Button9.Click
        TextBox1.Text = TextBox1.Text + "5"
    End Sub

    Private Sub Button10_Click(sender As Object, e As EventArgs) Handles Button10.Click
        TextBox1.Text = TextBox1.Text + "6"
    End Sub

    Private Sub Button11_Click(sender As Object, e As EventArgs) Handles Button11.Click
        TextBox1.Text = TextBox1.Text + "7"
    End Sub

    Private Sub Button12_Click(sender As Object, e As EventArgs) Handles Button12.Click
        TextBox1.Text = TextBox1.Text + "8"
    End Sub

    Private Sub Button13_Click(sender As Object, e As EventArgs) Handles Button13.Click
        TextBox1.Text = TextBox1.Text + "9"
    End Sub

    Private Sub Button4_Click(sender As Object, e As EventArgs) Handles Button4.Click
        TextBox1.Text = ""
        Label2.Text = ""
        Label1.Text = ""
    End Sub

    Private Sub Button24_Click(sender As Object, e As EventArgs) Handles Button24.Click
        If Label2.Text = "+" Then
            TextBox1.Text = Val(Label1.Text) + Val(TextBox1.Text)
            Label1.Text = ""
            Label2.Text = "+"
        End If
    End Sub
End Class