This code allows you to use Win32 DLLs in your .NET applications.

public class Form1 : System.Windows.Forms.Form
{
[DllImport("GetMyCode.dll")]
public static extern string GenerateMyCode(string pProduct, 
  string pVersion, string pName);

// other form properties, etc...

Note that, below the [DllImport] attribute, you must declare the functions and procedures exported by the DLL you want to use.