C#

<br />
public static string GetFromAddress(MailItem mail)<br />
{<br />
            MailItem objItem;<br />
            MAPI.Session objSession;<br />
            MAPI.Message objMsg;<br />
            MAPI.AddressEntry objSender;<br />
            String strAddress;<br />
            String strName;<br />
            String strEntryID;<br />
            objOutlook = GetApplication();<br />
            strName = mail.SenderName;<br />
            strEntryID = mail.EntryID;<br />
            objSession = new MAPI.Session();<br />
            object pobjMissing = System.Reflection.Missing.Value;<br />
            objSession.Logon("", "", pobjMissing, pobjMissing, pobjMissing, pobjMissing, mail.SenderEmailAddress);<br />
             objMsg = (MAPI.Message)objSession.GetMessage(strEntryID, false);<br />
            objSender = (MAPI.AddressEntry)objMsg.Sender;<br />
            strAddress = objSender.Address.ToString();<br />
            objSession.Logoff();<br />
            return strAddress;<br />
<br />
<br />
}<br />

using System;
using System.Runtime.InteropServices;

namespace CsharpManaged
{
    class Program
    {
        public delegate void CallbackDelegate([MarshalAs(UnmanagedType.LPArray, SizeParamIndex = 1)] String[] ar, int len);
        
        [DllImport("CppDLLUnmanaged.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern void SetCallBackPointer(CallbackDelegate DelegatePassedToDLL);

        [DllImport("CppDLLUnmanaged.dll", CallingConvention = CallingConvention.StdCall)]
        private static extern void InvokeCallBack();

        static void Main(string[] args)
        {
            SetCallBackPointer(new CallbackDelegate(CallbackFunction));
            InvokeCallBack();

            Console.ReadLine();
        }

        private static void CallbackFunction(String[] ar, int len)
        {
            Console.WriteLine("I'm an array of " + ar.Length + " positions!");
            foreach(String element in ar)
            {
                Console.WriteLine(element);
            }
        }
    }
}

typedef void __stdcall CALL_BACK_FUNCTION(char* ar[], int len);
CALL_BACK_FUNCTION *pFunction;

__declspec(dllexport) void __stdcall SetCallBackPointer(CALL_BACK_FUNCTION* FnAddress)
{
	pFunction = FnAddress;
}

__declspec(dllexport) void __stdcall InvokeCallBack()
{
	int len = 5;
	char** myArray = new char*[len];

	myArray[0] = "A";
	myArray[1] = "AB";
	myArray[2] = "ABC";
	myArray[3] = "ABCD";
	myArray[4] = "ABCDE";

	pFunction(myArray,len);

	delete [] myArray;
}

typedef void __stdcall CALL_BACK_FUNCTION(char* ar[], int len);

typedef void __stdcall CALL_BACK_FUNCTION(char* ar[], int len, char* result);