Hello All, I am trying to use a c# dll in python application I follows the following steps. import CLR from CLR.System.Reflection import Assembly my_dll_name = Assembly.LoadWithPartialName('VPCI') from CLR.System.Windows.Forms import Form from CLR.TestWinForm import Form1 VPCI = Form1()// Form1 is a class in my .net dll but I am getting CLR.system.DllNotFoundException:unalble to laod DLL(gpci.dll) While gpci.dll is defined in my .net application as [DllImport("gpcifunc.dll")] unsafe public static extern Int32 gpciOpen (Int32 dReserved) ; Form where the exception genrating Can any one help me out. 2) in case I am using my_dll_name = Assembly.LoadWithPartialName('path of dll') Then my_dll_name is getting none while I am keeping the dll in my python root path it is working fine Anyone has any clue. Regard's Lalit