I am trying to code a (Visual Studio)C# test program in order to control an ActiveX component. The connection between the component and my test program is done. The component exposes methods that use a parameter System.object. I don't know how I should make such a parameter. In the activeX component (coded in C++), this parameter is described as a pointer to a DISPATCH object (a IDataContainer type). As I'm quite new to COM and ActiveX, and I haven't found any information about how to make this function call? thanks in advance, See you, SlY