Cannot resolve symbol Services when using Configuration.Services.GetContentNegotiator()
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I wanted to retrieve conneg by using following line of code. 

    Configuration.Services.GetContentNegotiator

It gives me an error "Cannot resolve symbol Services".  I am building ASP.NET Web API using ASP.NET MVC 4.  Services is a public property of System.Web.Http.HttpConfiguration but I can't get a reference of that object.  
