Windows Phone 7 C# error Attepting to call function failed - c#

I am writing a test project "HelloPhone" in c# Windows Phone 7 and i am trying to use
a C++ DLL/clr. Well at execution i get an unhandled exception error reporting that attempt
to call the DLL function failed. I am not a C# programmer so here is my code:
using System;
using System.Runtime.InteropServices;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Tasks;
using Microsoft.Phone;
using DldesAPI;
using System.Runtime.InteropServices;
namespace DldesAPI
{
public class DldesLib
{
[DllImport("DLDESLIB.dll", CharSet = CharSet.Auto)]
public static extern int GetVersionNumber();
// [DllImport("DLDESLIB.dll")]
// public static extern int EncryptFirst(byte *pSrc,int SrcLen,byte *pDst,byte *pKey,int iKLen,long *wa,bool bRand);
}
}
namespace HelloPhone
{
public partial class MainPage : PhoneApplicationPage
{
// Constructor
public MainPage()
{
InitializeComponent();
}
private void ClickMeButton_Click(object sender, RoutedEventArgs e)
{
int x = 0;
string Msg;
Msg=MessageTextBox.Text;
x = 1;
x = DldesLib.GetVersionNumber();
}
}
}
Could you please tell me what i do wrong?
Thnk you.
Spyros

You probably won't be too happy to hear this, but using p/invoke or a C++/CLR DLL is not supported in Windows Phone 7.

yea duder, this kinda stuff probably isn't supported on WP7 (as far as I know):
using System.Runtime.InteropServices;
[DllImport("DLDESLIB.dll", CharSet = CharSet.Auto)]
It's running on a compact version of the .net framework.

Are you trying to get the DeviceFirmwareVersion or DeviceHardwareVersion? Can you just use:
DeviceExtendedProperties.GetValue("DeviceFirmwareVersion").ToString();
http://msdn.microsoft.com/en-us/library/ff941122(v=VS.92).aspx

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