The type or namespace name does not exist in the namespace ‘System.Web.Mvc’

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Clean your solution and then set the property of those files to Copy Local = True.

To set the Copy Local property to True or False

In Solution Explorer, click the Show All Files button to display the References node.

  • Open the References node for the project.
  • Right-click a reference in the References list, and click Properties.
    The properties associated with that reference appear in a list in the Properties window.
  • In the Properties window, change the Copy Local property to True or False.

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