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//Import cellcore.dll
 
[DllImport("cellcore.dll")]
 internal static extern int lineGetGeneralInfo(IntPtr hLine, byte[] bCache);
 
// code to get IMEI
private void getIMEIInfo()
{
string IMEI;
Tapi t = new Tapi();
t.Initialize();
Line _line = t.CreateLine(0, LINEMEDIAMODE.INTERACTIVEVOICE, LINECALLPRIVILEGE.MONITOR);
 
byte[] buffer = new byte[512];
//write size
BitConverter.GetBytes(512).CopyTo(buffer, 0);
 
if (lineGetGeneralInfo(_line.hLine, buffer) != 0)
{
throw new System.ComponentModel.Win32Exception(System.Runtime.InteropServices.Marshal.GetLastWin32Error(), "TAPI Error: " + System.Runtime.InteropServices.Marshal.GetLastWin32Error().ToString("X"));
}
 
int serialsize = BitConverter.ToInt32(buffer, 36);
int serialoffset = BitConverter.ToInt32(buffer, 40);
IMEI = System.Text.Encoding.Unicode.GetString(buffer, serialoffset, serialsize);
IMEI = IMEI.Substring(0, IMEI.IndexOf(Convert.ToChar(0)));
 
AppSettings.SetIMEI(IMEI);
_line.Dispose();
t.Shutdown();
}