Public Class Form1

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Try
            TextBox2.Text = TextBox1.Text.Replace("a", "01").Replace("A", "01").Replace("o", "01").Replace("O", "01")
        Catch ex As Exception
            MsgBox("error", vbCrLf & ex.Message)
        End Try
    End Sub

    Private Sub Button2_Click(sender As Object, e As EventArgs) Handles Button2.Click
        Clipboard.SetText(TextBox2.Text, TextDataFormat.Text)
    End Sub
End Class