Created A Form With Two Check Boxs And One Button?

I've created a form with two check boxs and one button. I added this code Public Class Form1

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Dim Bg1.txt As String = "C:UsersJoshDocumentsBg1.txt"
Dim objReader As New System.IO.StreamReader(Bg1.txt)
TextBox1.Text = objReader.ReadToEnd
objReader.Close()
End Sub
End Class

to the button thinking it would open Bg1.txt when clicked but it's not working?