Number Factorial in VB.NET

I wrote this program to ask the user to give a number and then the program will compute the factorial value of the given number by the user using Microsoft Visual Basic.NET.

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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 n, f, i As Integer

        f = 1

        n = Val(TextBox1.Text)

        For i = 1 To n

            f = f * i

        Next

        MsgBox("Factorial is :" & f, vbInformation, "Factorial")

    End Sub

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

        TextBox1.Text = ""

        TextBox1.Focus()

    End Sub

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

        If MsgBox("Are you sure you want to quit?", vbYesNo + vbQuestion, "Quit") = vbYes Then

            Me.Close()

        Else

            Me.Show()

            TextBox1.Text = ""

            TextBox1.Focus()

        End If

    End Sub

End Class