java.lang.UnsatisfiedLinkError: Error looking up function 'GetWallpaper'

[naved momin]

Hi, i am trying to call a simple method of a *.dll which i had wriiten in c# from Java using jna ..i have set jna.jar & platform.jar in the classpath but i m getting this error

Exception in thread "main" java.lang.UnsatisfiedLinkError: Error looking up function 'GetWallpaper': The specified procedure could not be found.

my complete code is

/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package wallpaper;

import com.sun.jna.Library;
import com.sun.jna.Native;

/**
 *
 * @author Naved Momin<[e-mail]>
 */
interface IWallpaper extends Library
{
   public void SetWallpaper(String path);
   public String GetWallpaper();
}
        

public class Wallpaper {

    public void start( ){
        String path = "C:/Users/Admin/Documents/Visual Studio 2010/Projects/SetWallpaper/"
                + "SetWallpaper/bin/Release/SetWallpaper.dll";
        IWallpaper wallpaper = (IWallpaper)Native.loadLibrary( path, IWallpaper.class );
        
        System.out.println( wallpaper.GetWallpaper() );
    }
    public static void main(String[] args) {
        // TODO code application logic here
        new Wallpaper().start();
    }
}

Edit: when i try

wallpaper.getClass().getDeclaredMethods()[1]

i get this

public final java.lang.String wallpaper.$Proxy0.GetWallpaper()

that means library is loaded successfully but i dont understand the mapping part , i mean why is this things

wallpaper.$Proxy0.

are added prefix to my method GetWallpaper ?
could any one please help ?