Addition of Two Numbers in Visual Basic.NET

A simple program that I wrote using Visual Basic.NET to add the sum of two numbers. I'm just learning Visual Basic.NET primarily because my experience before in programming in using Visual Basic 6 it is a good learning experience on my part.

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Sample Program Output

Program Listing

Public Class Form1

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

        Dim sum As Integer

        Dim a As Integer

        Dim b As Integer

        Label4.Visible = True

        If TextBox1.Text = "" Then

            Label4.Visible = False

            MessageBox.Show("Sorry cannot be empty.")

            TextBox1.Focus()

        End If

        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 Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load

        Label4.Visible = False

    End Sub

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

        TextBox1.Text = ""

        TextBox2.Text = ""

        Label4.Text = ""

        TextBox1.Focus()

    End Sub

End Class