title: Opening vs2010 C# project in vs2015 resulting in error in designer
body: <p>I can access the code but can not open the designer view. I can add new items and code them, only the existing item's designer view is returning these errors.</p>
  
  <p>I can also run and debug the program successfully.</p>
  
  <p>The only problem is that now that I have opened it on vs2015, it  can not be opened in vs2010 again.</p>
  
  <p>I have been Googling for hours and tried all sorts of things, but still no luck.</p>
  
  <p><strong>Stack trace:</strong></p>
  
  <pre><code>Error HRESULT E_FAIL has been returned from a call to a COM component
  at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)
  at Microsoft.VisualStudio.LanguageServices.Implementation.Utilities.Exceptions.ThrowEFail()
  at Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.CodeTypeRef.LookupTypeSymbol()
  at Microsoft.VisualStudio.LanguageServices.Implementation.CodeModel.CodeTypeRef.get_TypeKind()
  at EnvDTE.CodeTypeRef.get_TypeKind()
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.GetUrtTypeFromVsType(CodeTypeRef vsType)
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.OnTypePopulateMembers(Object sender, EventArgs e)
  at System.CodeDom.CodeTypeDeclaration.get_Members()
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.MergedCodeDomParser.CodeTypeDeclarationPopulator.OnPopulateMembers(Object sender, EventArgs e)
  at System.CodeDom.CodeTypeDeclaration.get_Members()
  at System.ComponentModel.Design.Serialization.TypeCodeDomSerializer.Deserialize(IDesignerSerializationManager manager, CodeTypeDeclaration declaration)
  at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
  at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload)
  </code></pre>