Error CS0117: NamespaceOuter does not contain a definition for NamespaceInner or The namespace in dll conflicts with the type in dll

In the last post regarding error will see how to resolve issue of Error Message: The property is part of the object's key information and cannot be modified

Sometimes we receive above error when trying to run our web site but does not show any error on the build and show build success. It is a strange situation when your solution builds successfully but show error when try to run the website and if you try to see namespace name in intelligence than we can see the name of the namespace.