How to read SIM Contacts of Windows Mobile

Programmatically read SIM contacts of windows mobile smart phone 5.0 and Pocket PC !! below is the sample code which is in C# after a rigorous search on internet i got this sample code so thought of posting it here...

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;

namespace DeviceApplication33
{
public partial class Form1 : Form
{
public Form1()
{
InitializeComponent();
}
private const Int64 S_OK = 0x00000000;
public const int SIM_CAPSTYPE_ALL = 0x3F; //
public const int SIM_PBSTORAGE_SIM = 0x10; //
public const int SIM_SMSSTORAGE_SIM = 0x2; //

[StructLayout(LayoutKind.Sequential)]
public struct SIMPHONEBOOKENTRY
{
public uint cbSize; //
public uint dwParams; //
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string lpszAddress; //
public uint dwAddressType; //
public uint dwNumPlan; //
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 256)]
public string lpszText; //
}

[DllImport("cellcore.dll")]
public static extern int SimInitialize(uint dwFlags,
int lpfnCallBack, uint dwParam, ref int lphSim);
[DllImport("cellcore.dll")]
public static extern int SimGetPhonebookStatus(int hSim,
uint dwLocation, ref uint lpdwUsed, ref uint lpdwTotal);
[DllImport("cellcore.dll")]
public static extern int SimReadPhonebookEntry(int hSim, uint dwLocation, uint dwIndex, ref SIMPHONEBOOKENTRY entry);
[DllImport("cellcore.dll", SetLastError = true)]
public static extern int SimDeinitialize(int hSim);

public static List GetSIMContactList()
{
int hSim = 0;
List list = new List();
try
{
int result = SimInitialize(0, 0, 0, ref hSim);
if (result != 0)
throw new Exception("SIM Contacts");
uint uiUsed = 0;
uint uiTotal = 0;
result = SimGetPhonebookStatus(hSim, SIM_PBSTORAGE_SIM, ref uiUsed, ref uiTotal);
for (int i = 1; i <= uiUsed; i++)
{
SIMPHONEBOOKENTRY entry = new SIMPHONEBOOKENTRY();
entry.cbSize = (uint)Marshal.SizeOf(typeof(SIMPHONEBOOKENTRY));
result = SimReadPhonebookEntry(hSim, SIM_PBSTORAGE_SIM, (uint)i, ref entry);
list.Add(new string[2] { entry.lpszText.Trim(), entry.lpszAddress.Trim() });
}
return list;
}
catch
{
throw;
}
finally
{
SimDeinitialize(hSim);
}
}
private void Form1_Load(object sender, EventArgs e)
{}
}
}

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