Fibonacci Sequence in VB.NET

 A simple fibonacci sequence in vb.net that I wrote that will ask the user to give an integer value and then it will generate the fibonacci sequence in the listview in Visual Basic 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 = 0

        Dim b As Integer = 1

        Dim fib As Integer

        Dim userinput, i As Integer

        userinput = Val(TextBox1.Text)

        i = userinput

        ListView1.Items.Add(1)

        Do

            fib = a + b

            a = b

            b = fib

            ListView1.Items.Add(fib)

            i = i + 1

        Loop While fib < i

    End Sub

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

        TextBox1.Text = ""

        ListView1.Clear()

        TextBox1.Focus()

    End Sub

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

        End

    End Sub

End Class