The first thing I see is that no method or subroutine has been declared.
That is essential.
How about declaring a Main
like this:
Public Class Form1
Sub Main()
Dim strPathFile As String
Dim strFile As String
...
End Sub
End Class
This will give your application a staring point.
May I suggest MSDN - Microsoft Developer Network - specifically the video walk through labelled "Visual Basic Fundamentals: Development for Absolute Beginners".