Make Turbo C DLL to use in C# windows application

In some cases of our professional life we need to parse or decode or handle large number of file. As you knew that for IO purpose turbo C is faster than other technologies like dot net or something else. In my cases i need to develop an ASN decoder where i need to decode more than million of files. In such cases i need to develop a ASN decoder. In my cases i have done the following way:
1. Create