'Ajax' does not exist in the namespace 'System.Web.Mvc'

'Ajax' does not exist in the namespace 'System.Web.Mvc'

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Is "jquery.unobtrusive-ajax.js" obsolete?

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How can I return a JSON result to a Ajax.BeginForm

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Ajax.BeginForm doesn't fire AJAX script, falls back on postback

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Unobtrusive AJAX error: "Uncaught ReferenceError: Sys is not defined"

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Disable all buttons on page

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How to pass a list of id's in a AJAX request to the Server in MVC

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Render a View after an AJAX call in asp.net MVC

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How to scale out signalr to a large number of users

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MVC 5 invalid JSON primitive

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How to send AntiForgeryToken (CSRF) along with FormData via jquery ajax

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ASP .Net MVC 5 JsonResult caching

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How do I prevent Ajax calls from keeping a session alive?

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ASP.NET MVC5 Bootstrap 3 Modal Form not validating client-side and is posting back to page

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MVC5, AjaxHelper, and the Correct Scripts & Load Order

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