Addition of Two Numbers in VB.NET

I wrote this program to ask the user to give two integer number and then the program will compute the sum of two numbers using Visual Basic NET as my programming language.

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Sample Program Output

Program Listing

Public Class Form1

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click

        Dim sum, a, b

        a = Val(TextBox1.Text)

        b = Val(TextBox2.Text)

        sum = (a + b)

        Label4.Text = "The sum of " & a & " and " & b & " is " & sum & "."

    End Sub

    Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click

        TextBox1.Text = ""

        TextBox2.Text = ""

        Label4.Text = ""

        TextBox1.Focus()

    End Sub

    Private Sub Button3_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button3.Click

        End

    End Sub

End Class