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using System.Windows.Forms;

namespace dllNamespace
{
    public class dllClass
    {
        public static int ShowMsg( string msg )
        {
            MessageBox.Show( msg );
            return 0;
        }
   }
}

#include "FiveWin.ch"

function Main()

   FW_DotNet( "test.dll", "dllNamespace.dllClass", "ShowMsg", "C# from FWH" )

   FW_DotNet( "test.dll", "dllNamespace.dllClass", "ShowMsg", "yes!!!" )

return nil

#include "FiveWin.ch"

function Main()

   local oNet

   oNet := TDotNet():New()
    ? IIF(oNet != nil, "Net yes!", "Net no :(")
    XBrowse(__objGetValueList(oNet))
    
    oNet:Execute("SimpleDllFramework.dll", "SimpleDllFramework.Class1", "GetNumber", 2)
    ? oNet:GetNetError()
    ? oNet:GetReturnValue()
   
   oNet:End()
   
return nil

┌────────────────────────────────────────────────────────────────────────────┐
?FiveWin for xHarbour 19.03 - Mar. 2019          xHarbour development power │▄
?(c) FiveTech 1993-2019 for Microsoft Windows 9X/NT/200X/ME/XP/Vista/7/8/10 │█
└────────────────────────────────────────────────────────────────────────────┘?
  ▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀▀?
Compiling...
xHarbour 1.2.3 Intl. (SimpLex) (Build 20190603)
Copyright 1999-2018, http://www.xharbour.org <!-- m --><a class="postlink" href="http://www.harbour-project.org/">http://www.harbour-project.org/</a><!-- m -->
Compiling 'dotnet.prg' and generating preprocessed output to 'dotnet.ppo'...
Generating C source output to 'dotnet.c'...
Done.
Lines 27, Functions/Procedures 1, pCodes 69
Embarcadero C++ 7.30 for Win32 Copyright (c) 1993-2017 Embarcadero Technologies,
 Inc.
dotnet.c:
Turbo Incremental Link 6.80 Copyright (c) 1997-2017 Embarcadero Technologies, In
c.
* Application successfully built *

namespace SimpleDllFramework
{
    public class Class1
    {
      public static int GetNumber(int input = 1)
      {
         return input * 10;
      }
   }
}