title: "Could Not Load Type" on deployed site refering to old pages/classes
body: <p>When I run my code in VS debugger and set it to catch CLR exceptions when thrown, I get tons of these HttpExceptions saying "Could Not Load Type" that refer to pages/classes which have been removed from the application.  It does not cause any problem with the pages (.NET knows to ignore this exception somehow), but it's really annoying.</p>
  
  <p>Stack Trace:</p>
  
  <pre><code>System.Web.dll!System.Web.UI.TemplateParser.GetType(string typeName, bool ignoreCase, bool throwOnError) + 0x1b0 bytes  
  System.Web.dll!System.Web.UI.TemplateParser.ProcessInheritsAttribute(string baseTypeName, string codeFileBaseTypeName, string src, System.Reflection.Assembly assembly) + 0x62 bytes    
  System.Web.dll!System.Web.UI.TemplateParser.PostProcessMainDirectiveAttributes(System.Collections.IDictionary parseData) + 0x118 bytes  
  System.Web.dll!System.Web.UI.PageParser.PostProcessMainDirectiveAttributes(System.Collections.IDictionary parseData) + 0x6b bytes   
  System.Web.dll!System.Web.UI.TemplateParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0x18b bytes    
  System.Web.dll!System.Web.UI.TemplateControlParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0x90 bytes  
  System.Web.dll!System.Web.UI.PageParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0x11 bytes 
  System.Web.dll!System.Web.UI.TemplateParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x13f bytes  
  System.Web.dll!System.Web.UI.BaseTemplateParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x1ea bytes  
  System.Web.dll!System.Web.UI.TemplateControlParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x44 bytes    
  System.Web.dll!System.Web.UI.PageParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x45 bytes   
  System.Web.dll!System.Web.UI.TemplateParser.ParseStringInternal(string text, System.Text.Encoding fileEncoding) + 0x378 bytes   
  System.Web.dll!System.Web.UI.TemplateParser.ParseString(string text, System.Web.VirtualPath virtualPath, System.Text.Encoding fileEncoding) + 0x6f bytes    
  System.Web.dll!System.Web.UI.TemplateParser.ParseFile(string physicalPath, System.Web.VirtualPath virtualPath) + 0x115 bytes    
  System.Web.dll!System.Web.UI.TemplateParser.ParseInternal() + 0x57 bytes    
  System.Web.dll!System.Web.UI.TemplateParser.Parse() + 0x64 bytes    
  System.Web.dll!System.Web.Compilation.BaseTemplateBuildProvider.CodeCompilerType.get() + 0x6f bytes 
  System.Web.dll!System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(System.Web.Compilation.BuildProvider buildProvider) + 0x42 bytes   
  System.Web.dll!System.Web.Compilation.WebDirectoryBatchCompiler.CompileNonDependentBuildProviders(System.Collections.ICollection buildProviders) + 0xca bytes   
  System.Web.dll!System.Web.Compilation.WebDirectoryBatchCompiler.Process() + 0x5d bytes  
  System.Web.dll!System.Web.Compilation.BuildManager.BatchCompileWebDirectoryInternal(System.Web.Hosting.VirtualDirectory vdir, bool ignoreErrors) + 0x48 bytes   
  System.Web.dll!System.Web.Compilation.BuildManager.BatchCompileWebDirectory(System.Web.Hosting.VirtualDirectory vdir, System.Web.VirtualPath virtualDir, bool ignoreErrors) + 0xbc bytes    
  System.Web.dll!System.Web.Compilation.BuildManager.CompileWebFile(System.Web.VirtualPath virtualPath) + 0x5d bytes  
  System.Web.dll!System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(System.Web.VirtualPath virtualPath, bool noBuild, bool allowCrossApp, bool allowBuildInPrecompile, bool throwIfNotFound, bool ensureIsUpToDate) + 0x141 bytes    
  System.Web.dll!System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(System.Web.HttpContext context, System.Web.VirtualPath virtualPath, bool noBuild, bool allowCrossApp, bool allowBuildInPrecompile, bool throwIfNotFound, bool ensureIsUpToDate) + 0x70 bytes 
  System.Web.dll!System.Web.Compilation.BuildManager.GetVPathBuildResult(System.Web.HttpContext context, System.Web.VirtualPath virtualPath, bool noBuild, bool allowCrossApp, bool allowBuildInPrecompile, bool ensureIsUpToDate) + 0x5b bytes   
  System.Web.dll!System.Web.UI.BaseTemplateParser.GetReferencedType(System.Web.VirtualPath virtualPath, bool allowNoCompile) + 0x51 bytes 
  System.Web.dll!System.Web.UI.PageParser.ProcessMainDirectiveAttribute(string deviceName, string name, string value, System.Collections.IDictionary parseData) + 0x67e bytes 
  System.Web.dll!System.Web.UI.TemplateParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0xf9 bytes 
  System.Web.dll!System.Web.UI.TemplateControlParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0x90 bytes  
  System.Web.dll!System.Web.UI.PageParser.ProcessMainDirective(System.Collections.IDictionary mainDirective) + 0x11 bytes 
  System.Web.dll!System.Web.UI.TemplateParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x13f bytes  
  System.Web.dll!System.Web.UI.BaseTemplateParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x1ea bytes  
  System.Web.dll!System.Web.UI.TemplateControlParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x44 bytes    
  System.Web.dll!System.Web.UI.PageParser.ProcessDirective(string directiveName, System.Collections.IDictionary directive) + 0x45 bytes   
  System.Web.dll!System.Web.UI.TemplateParser.ParseStringInternal(string text, System.Text.Encoding fileEncoding) + 0x378 bytes   
  System.Web.dll!System.Web.UI.TemplateParser.ParseString(string text, System.Web.VirtualPath virtualPath, System.Text.Encoding fileEncoding) + 0x6f bytes    
  System.Web.dll!System.Web.UI.TemplateParser.ParseFile(string physicalPath, System.Web.VirtualPath virtualPath) + 0x115 bytes    
  System.Web.dll!System.Web.UI.TemplateParser.ParseInternal() + 0x57 bytes    
  System.Web.dll!System.Web.UI.TemplateParser.Parse() + 0x64 bytes    
  System.Web.dll!System.Web.Compilation.BaseTemplateBuildProvider.CodeCompilerType.get() + 0x6f bytes 
  System.Web.dll!System.Web.Compilation.BuildProvider.GetCompilerTypeFromBuildProvider(System.Web.Compilation.BuildProvider buildProvider) + 0x42 bytes   
  System.Web.dll!System.Web.Compilation.WebDirectoryBatchCompiler.CompileNonDependentBuildProviders(System.Collections.ICollection buildProviders) + 0xca bytes   
  System.Web.dll!System.Web.Compilation.WebDirectoryBatchCompiler.Process() + 0x5d bytes  
  System.Web.dll!System.Web.Compilation.BuildManager.BatchCompileWebDirectoryInternal(System.Web.Hosting.VirtualDirectory vdir, bool ignoreErrors) + 0x48 bytes   
  System.Web.dll!System.Web.Compilation.BuildManager.BatchCompileWebDirectory(System.Web.Hosting.VirtualDirectory vdir, System.Web.VirtualPath virtualDir, bool ignoreErrors) + 0xbc bytes    
  System.Web.dll!System.Web.Compilation.BuildManager.CompileWebFile(System.Web.VirtualPath virtualPath) + 0x5d bytes  
  System.Web.dll!System.Web.Compilation.BuildManager.GetVPathBuildResultInternal(System.Web.VirtualPath virtualPath, bool noBuild, bool allowCrossApp, bool allowBuildInPrecompile, bool throwIfNotFound, bool ensureIsUpToDate) + 0x141 bytes    
  System.Web.dll!System.Web.Compilation.BuildManager.GetVPathBuildResultWithNoAssert(System.Web.HttpContext context, System.Web.VirtualPath virtualPath, bool noBuild, bool allowCrossApp, bool allowBuildInPrecompile, bool throwIfNotFound, bool ensureIsUpToDate) + 0x70 bytes 
  System.Web.dll!System.Web.Compilation.BuildManager.GetVirtualPathObjectFactory(System.Web.VirtualPath virtualPath, System.Web.HttpContext context, bool allowCrossApp, bool throwIfNotFound) + 0x7e bytes   
  System.Web.dll!System.Web.Compilation.BuildManager.CreateInstanceFromVirtualPath(System.Web.VirtualPath virtualPath, System.Type requiredBaseType, System.Web.HttpContext context, bool allowCrossApp) + 0x35 bytes 
  System.Web.dll!System.Web.UI.PageHandlerFactory.GetHandlerHelper(System.Web.HttpContext context, string requestType, System.Web.VirtualPath virtualPath, string physicalPath) + 0x20 bytes  
  System.Web.dll!System.Web.UI.PageHandlerFactory.GetHandler(System.Web.HttpContext context, string requestType, string virtualPath, string path) + 0x26 bytes    
  System.Web.dll!System.Web.HttpApplication.MaterializeHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() + 0x14f bytes 
  System.Web.dll!System.Web.HttpApplication.ExecuteStep(System.Web.HttpApplication.IExecutionStep step, ref bool completedSynchronously) + 0xb9 bytes 
  System.Web.dll!System.Web.HttpApplication.PipelineStepManager.ResumeSteps(System.Exception error) + 0x39f bytes 
  System.Web.dll!System.Web.HttpApplication.BeginProcessRequestNotification(System.Web.HttpContext context, System.AsyncCallback cb) + 0x5a bytes 
  System.Web.dll!System.Web.HttpRuntime.ProcessRequestNotificationPrivate(System.Web.Hosting.IIS7WorkerRequest wr, System.Web.HttpContext context) + 0xbe bytes   
  System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr managedHttpContext, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) + 0x247 bytes 
  System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr managedHttpContext, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) + 0x29 bytes    
  [Native to Managed Transition]  
  [Managed to Native Transition]  
  System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotificationHelper(System.IntPtr managedHttpContext, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) + 0x2cc bytes 
  System.Web.dll!System.Web.Hosting.PipelineRuntime.ProcessRequestNotification(System.IntPtr managedHttpContext, System.IntPtr nativeRequestContext, System.IntPtr moduleData, int flags) + 0x29 bytes    
  [Appdomain Transition]  
  </code></pre>