Reflector反编译了DLL文件，无修改，再编译成DLL文件，由原来的300K，变成97K了，并且不能使用

我用Reflector反编译了DLL文件，无修改，再编译成DLL文件，由原来的300K，变成97K了，并且不能使用，报错如下：
[HttpException (0x80004005): 试图加载字符串资源时出错(FindResource 失败，错误为 -2147023083)。]
   System.Web.StringResourceManager.ReadSafeStringResource(Type t) +8682073
   System.Web.UI.TemplateControl.ReadStringResource() +14
   ASP.product_aspx..ctor() in C:\Documents and Settings\Administrator\桌面\20110225\App_Web_mec-iolb\ASP\product_aspx.cs:24
   __ASP.FastObjectFactory_app_web_mec_iolb.Create_ASP_product_aspx() in C:\Documents and Settings\Administrator\桌面\20110225\App_Web_mec-iolb\__ASP\FastObjectFactory_app_web_mec_iolb.cs:154
   System.Web.Compilation.BuildResultCompiledType.CreateInstance() +32
   System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(VirtualPath virtualPath, Type requiredBaseType, HttpContext context, Boolean allowCrossApp, Boolean noAssert) +119
   System.Web.UI.PageHandlerFactory.GetHandlerHelper(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +33
   System.Web.UI.PageHandlerFactory.System.Web.IHttpHandlerFactory2.GetHandler(HttpContext context, String requestType, VirtualPath virtualPath, String physicalPath) +40
   System.Web.HttpApplication.MapHttpHandler(HttpContext context, String requestType, VirtualPath path, String pathTranslated, Boolean useAppConfig) +160
   System.Web.MapHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +93
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

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请问怎么解决，感谢！ --------------------编程问答-------------------- 编译成DLL文件时没有报错 --------------------编程问答-------------------- 还是要修改的
--------------------编程问答-------------------- 请问是编译dll吗？能不能直接编译c#里的exe

补充：.NET技术 ,  ASP.NET