为什么做.Net 2.0构建干净的解决方案导致错误？

I have a .net Solution that creates a DLL. It it made up of two projects. (Side information one contains a number of my special functions/classes etc. written in VB.Net. The second is some functions/classes etc. that are specific to a client and these use my classes) After some this and that and the other work I can build and rebuild the solution with no trouble. No error, warnings etc.I have a .net Solution that creates a DLL. It i