How to find Entry Point of COM DLL

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ASP.NET

Hello All

do you have any Idea regarding finding of the entry point for a COM API to access its functions.
i am using the following code in a C# project


[DllImport("C:\\Program Files\\Readsoft\\FORMS\\Bin\\Interop.VWRUNTIMELib.dll")]
public static extern string OnAppStart();

when i use this function it Gives me Error that
unable to find Entry point OnAppStart() for DLL "C:\\Program Files\\Readsoft\\FORMS\\Bin\\Interop.VWRUNTIMELib.dll"

please guide me that how i can funcd the entry point for this or if you have any other suggestion....

thanks & Regards
Suresh KHarod