Hi, The ASP.NET engine seems to have problems with calling unmanaged DLL. You can call unmanaged DLL with Interopservces with such a code [DllImport("ImportCoreASPNET.DLL", EntryPoint = "?import_4aspnet_start_it@@YAHPBD@Z")] static extern int import_4aspnet_start_it(string filename); there are two requisites: 1. place the dll in a directory included in PATH (environment variable) 2. make sure that the dll does not call other DLL. (I had problem with one dll calling 3 others, and dll or entrypoints are never found) So I had to merge my dlls in unique one to make it works with ASP.NET. Regards,
Le Sourcier