Macro working in VSTA but not from dll

Really appreciate who can spend couple of minutes to help me out, so thanks in advance !

Got myself into situation where running macro in VSTA works (vb.net), but running dll files from solidworks does not work. Probably forgetting something very simple. Principle is that text file is in same folder as dll files and by default read from that folder without long location "string"

This works in VSTA and after building dll (very simple)

-----

Partial Class SolidWorksMacro

   Public Sub main()

    Dim Model As ModelDoc2 = swApp.ActiveDoc

    Dim LayerName As String = "Stamp"

    MsgBox(LayerName)

  End Sub

-----

No I want to do same thing in a way that layer name is read from text file. It works when running from VSTA, but after building to dll and running from solidworks it gives error: cannot open "Location"\macro.dll.

----

Partial Class SolidWorksMacro

  Public Sub main()

    Dim Model As ModelDoc2 = swApp.ActiveDoc

    Dim LayerName As String = "Stamp"

    Dim FileName As String = "LayerName.txt"

    Dim LayerName As String

    Dim sr As New StreamReader(FileName)

    LayerName = sr.ReadLine

    MsgBox(LayerName)

  End Sub

----

SolidworksApi macros