title: visual studio form designer: error while creating a new form
body: <p>I'm working on a project in visualstudio10 in C#.
  After I made a form, I've tried to add another one to the project but VS can't open the designer nor create the proper file for the form
  It just creates a file named "form2.cs" and another named "form2.designer.cs" but it won't open the designer. Instead it response with the following messages:
  "error during creating 'Namespace provider'  " and show me the call stack as follow:</p>
  
  <pre><code>in Microsoft.VisualStudio.CSharp.Services.Language.Interop.IWorld.ConstructNamespace(IntPtr owner, IntPtr baseNodePtr, Boolean noTypeRestrictionInNamespace)
  in Microsoft.VisualStudio.CSharp.Services.Language.Interop.WorldExtensions.ConstructNamespaceFromNode(IWorld world, ParseTreeNode context, Boolean noTypeRestriction)
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CFileCodeModel.TryBindType(Compilation compilation, TypeBaseNode typeNode)
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CBasesCollection.IsBaseDefined(Compilation compilation, ParseTreeNode pNode)
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CBasesCollection.Item(Object vtIndex)
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CSlowSnapshot..ctor(CodeElements collection)
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CBasesCollection.CreateSnapshot()
  in Microsoft.VisualStudio.CSharp.Services.Language.CodeModel.CCollectionBase.GetEnumerator()
  in EnvDTE.CodeElements.GetEnumerator()
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.CodeTypeDeclarationFromCodeClass(CodeClass vsClass)
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.OnNamespacePopulateTypes(Object sender, EventArgs e)
  in System.CodeDom.CodeNamespace.get_Types()  
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomParser.Parse(TextReader codeStream)
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.MergedCodeDomParser.System.CodeDom.Compiler.ICodeParser.Parse(TextReader stream)
  in System.CodeDom.Compiler.CodeDomProvider.Parse(TextReader codeStream)
  in Microsoft.VisualStudio.Shell.Design.Serialization.CodeDom.CodeDomDocDataAdapter.get_CompileUnit()
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
  in Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.DeferredLoadHandler.Microsoft.VisualStudio.TextManager.Interop.IVsTextBufferDataEvents.OnLoadCompleted(Int32 fReload) 
  </code></pre>
  
  <p>Any help would be appreciate...</p>
  
  <p><strong>sry: I just add the default namespace in the project properties and everything gone right...</strong></p>