Hi, as relative newbe into C#integration  with PB (2919 R2) I thought I'd give it a try. So I started with a  .net dll function as simple as it could be created with snapdevelop in powerscript.

- Snapdevelop ClassLibrary 1 c# Code:

using System;
namespace tester
{
    public class Utility 
    {
        public string ReadEnv()
        {
            string user = Environment.UserName;
            return user;
        }
    }
}

- Compiled, Built and Published fine with all depedenys to directory D:\Temp\pp\

- Imported into Powerbuilder with .NET DLL Importer as nvo_utility,  PB Source code follows

forward
global type nvo_utility from dotnetobject
end type
end forward

global type nvo_utility from dotnetobject
end type
global nvo_utility nvo_utility

type variables

PUBLIC:
String is_assemblypath = "D:\Temp\pp\ClassLibrary1.dll"
String is_classname = "tester.Utility"
end variables

forward prototypes
public function string of_readenv ()
end prototypes

public function string of_readenv ();
//*-----------------------------------------------------------------*/
//*  .NET function : ReadEnv
//*   Return : String
//*-----------------------------------------------------------------*/

Return This.readenv()
end function

on nvo_utility.create
call super::create
TriggerEvent( this, "constructor" )
end on

on nvo_utility.destroy
TriggerEvent( this, "destructor" )
call super::destroy
end on

- Trying to use it in PB results in Error "Object instance does not exist " - cb_1.clicked() event

string ls_username
nvo_utility lnvo_utility
lnvo_utility = create nvo_utility
ls_username = lnvo_utility.of_readenv( )  // Exits with error
messagebox("Gotcha",ls_username)
destroy lnvo_utility

I tried chaging the "Return This.readenv()" to  "Return This:ReadEnv()" since c# is case sensitive but run into same runtime error. Then i tried Bruce's .Net Importer Demo from CodeExchange resulting in the same Error as soon as I call the windows function of_sendmail from w.main.

Any Idea's what I'm missing?

regards

Peter

P.S. I Sure look forward to the elevate conference!