e:\GomyeWeb\Controls\AddArt.ascx.cs(15): error CS0246: 找不到类型或命名空间名称“Year12”(是否缺少 using 指令或程序集引用?)

System.Web

在 System.Web.Compilation.BuildManager.PostProcessFoundBuildResult(BuildResult result, Boolean keyFromVPP, VirtualPath virtualPath) 在 System.Web.Compilation.BuildManager.GetBuildResultFromCacheInternal(String cacheKey, Boolean keyFromVPP, VirtualPath virtualPath, Int64 hashCode) 在 System.Web.Compilation.BuildManager.GetVPathBuildResultFromCacheInternal(VirtualPath virtualPath) 在 System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) 在 System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(HttpContext context, VirtualPath virtualPath, Boolean noBuild, Boolean allowCrossApp, Boolean allowBuildInPrecompile) 在 System.Web.UI.BaseTemplateParser.GetReferencedType(VirtualPath virtualPath, Boolean allowNoCompile) 在 System.Web.UI.BaseTemplateParser.GetUserControlType(VirtualPath virtualPath) 在 System.Web.UI.MainTagNameToTypeMapper.ProcessUserControlRegistration(UserControlRegisterEntry ucRegisterEntry) 在 System.Web.UI.BaseTemplateParser.ProcessDirective(String directiveName, IDictionary directive) 在 System.Web.UI.TemplateControlParser.ProcessDirective(String directiveName, IDictionary directive) 在 System.Web.UI.PageParser.ProcessDirective(String directiveName, IDictionary directive) 在 System.Web.UI.TemplateParser.ParseStringInternal(String text, Encoding fileEncoding)