Missing reference while Converting VS2008 project to VS2010 project

Question

When i converted a VS2008 project to 2010 it shows an error message

The type name 'IComponentConnector' could not be found in the namespace 'System.Windows.Markup'. This type has been forwarded to assembly 'System.Xaml, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' Consider adding a reference to that assembly

and it was build when we add a reference System.Xaml. What would be the reason for need to add additional reference?

Answer 1

In .Net 3.5/3,0, IComponentConnector (namespace System.Windows.Markup) was part of WindowsBase.dll and it was moved in System.Xaml in .net 4.0 onwards.

It seems you are upgrading your project framework 3.5 to 4.0