Can't seem to figure out how to use a function return variable in global Dims example code:

Public Class Main
  Dim Path As String = FixPath()
  Dim fixwrongtxt As String = Path & "tryme.txt"

  Private Sub Main_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
    FixPath()
    On_load()
  End Sub

  Private Function FixPath() As String
    Path = "C:\test"
    MsgBox(Path) //First Message Box'
    Return Path
  End Function

  Sub On_load()
    MsgBox(fixwrongtxt) //Second Message Box
  End Sub
End Class

when I run it all I get the first message box that contains "C:\test" and I click ok and on the second messagebox I get "custom.dll" with out the "C:\test" or "Path Return" What am I doing wrong? I know I can't use // in vb.net. I have also tried adding "FixPath()" under Sub On_load() but got same result. Also the reason I have to have these global is because I have around 30 Subs that refer to "Path" Variable... Thanks