http://www.c-sharpcorner.com/articles/Watch latest tutorials from .NET Assemblies© 1999 - 2012 Mindcracker LLC. All Rights ReservedThe System.Runtime.InteropServices namespace defines classes where some of which define methods that enable managed code to call native code. This is accomplished via an internal call and is called the Platform Invoke servicehttp://www.c-sharpcorner.com/uploadfile/TheButler/the-basics-of-net-framework-interoperability/default.aspx2/29/2008 12:00:00 AMDave