Error: Unable to find an entry point named 'xxx' in DLL 'yyy.dll'

To access any DLL file from C# windows application or from other application an entry point is required. Otherwise you will get the below exception:



Unable to find an entry point named 'xxx' in DLL 'yyy.dll'
OR
Entry point not found exception / error.

When you create any DLL file in VC++ from a turbo C program then you must have create a definition file where you will define the DLL entry