Difference of Two Numbers Using VB.NET

I wrote this program to ask the user to give two numbers and then the program will compute the difference between the two numbers and display the result on the screen using VB.NET

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Program Listing

Public Class Form1

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

        Dim a As Integer

        Dim b As Integer

        Dim difference As Integer

        a = Val(TextBox1.Text)

        b = Val(TextBox2.Text)

        ' compute the difference between variable a and variable b

        difference = (a - b)

        TextBox3.Text = difference

    End Sub

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

        TextBox1.Text = ""

        TextBox2.Text = ""

        TextBox3.Text = ""

        TextBox1.Focus()

    End Sub

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

        End

    End Sub

End Class