How to combine C language and c# to use programs in library management system

The system combines C language and c# to use as follows:

In the Windows environment, you can interact with C# through a dynamic link library (DLL) written in C language.

1. You need to write code in C language and compile it into DLL.

2. Import and use this DLL in C#. In C#, you can call functions in DLL by defining external functions.

3.C# code written in C language.