Compiler error message: CS1595: "btnet.dbutil" has been defined in multiple; use "C: /Windows / Microsoft.Net/framework/v1.1.4322/temporary ASP.NET FILES / BUGTRACKER / E36CE4F5 / 40A4B32B / askEMBLY / DL2 The definition in / 5_0eb0c401/bugtracker.dll is not allowed, and later the Microsoft's website is, saying that the ASPNET user does not have List, add the ASPNET to the Administrator group, and delete the original bin directory. DLL and other files, compile operation again, and solve the problem. Farming! ! !