.NET [VB.NET] File size change notification

Code
Imports System.IO

'You will get an error if you do not have a file in the path directory that is listed in TextBox1





Public Class Form1

    Dim path As String

    Dim test1 As Integer

    Dim test2 As Integer





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

        test2 = test1

    End Sub



    Private Function GetFileSize(ByVal MyFilePath As String) As Long

        Dim MyFile As New FileInfo(MyFilePath)

        Dim FileSize As Long = MyFile.Length

        Return FileSize

    End Function



    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        'Change the number if you want a diffent serial port

        SerialPort1.Open()

        path = TextBox1.Text

        Label1.Text = GetFileSize(path)

        test1 = Label1.Text

        test2 = Label1.Text

    End Sub





    Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick

        path = TextBox1.Text

        Label1.Text = GetFileSize(path)

        test1 = Label1.Text

        If test1 <> test2 Then

            Label2.BackColor = Color.Red

            'This is for RTS as a output

            'SerialPort1.RtsEnable = True

            SerialPort1.DtrEnable = True

        Else

            Label2.BackColor = Color.Black

            'This is for RTS as a output

            'SerialPort1.RtsEnable = False

            SerialPort1.DtrEnable = False

        End If

    End Sub



End Class