编译器错误消息: CS0433: 类型“CustomComponents.NewControl”同时存在于“c:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/b9a53c2e/7490fcb4/assembly/dl3/a26223b4/8697b819_bea7cb01/Web.DLL”和“c:/WINDOWS/Microsoft.NET/Framework/v2.0.50727/Temporary ASP.NET Files/root/b9a53c2e/7490fcb4/App_Code.knuqk0bz.dll”中
行 181: [System.Diagnostics.DebuggerNonUserCodeAttribute()]
行 182: private global::CustomComponents.NewControl @__BuildControlNewControl1() {
行 183: global::CustomComponents.NewControl @__ctrl;
原因：末知
解决方法：将位于App_Code内的类文件直接放在WEB根目录或其它目录内，重新编译后即可。