I am trying to use a dll in my c# program but I just cant seem to get it to work. I have made a test app shown below. The return value is 0, however it does not actually do what it is supposed to do.

Whereas the following command does work:

    rundll32 cmproxy.dll,SetProxy /source_filename proxy-1.txt /backup_filename roxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /Profile "C:\Documents and ettings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp"

Code:

    using System;
    using System.Collections.Generic;
    using System.Linq;
    using System.Text;
    using System.Security.Cryptography;
    using System.Runtime.InteropServices;
    using System.Net;
    using WUApiLib;

    namespace nac
    {
        class Program
        {
            [DllImport("cmproxy.dll", CharSet = CharSet.Unicode)]
            static extern int SetProxy(string cmdLine);

            static void Main(string[] args)
            {
                string cmdLine = @"/source_filename proxy-1.txt /backup_filename proxy.bak /DialRasEntry NULL /TunnelRasEntry DSLVPN /Profile ""C:\Documents and Settings\Administrator\Application Data\Microsoft\Network\Connections\Cm\dslvpn.cmp""";
                Console.WriteLine(SetProxy(cmdLine));
            }
        }
    }

Here is the contents of the dumpbin /exports command

File Type: DLL

  Section contains the following exports for cmproxy.dll

    00000000 characteristics
    3E7FEF8C time date stamp Tue Mar 25 05:56:28 2003
        0.00 version
           1 ordinal base
           1 number of functions
           1 number of names

    ordinal hint RVA      name

          1    0 00001B68 SetProxy

  Summary

        1000 .data
        1000 .reloc
        1000 .rsrc
        2000 .text

When this works it sets the proxy server for a VPN connection.