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AJAX is to do background operations without refreshing the page. The question on what to use is around usability - not performance.<br />
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If you are going to stay on the same page but need to send (and receive) data from the server then AJAX is the way you do it. If you are going to end up re-rendering the page after sending data to the server then there is not much motivation for using AJAX
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AJAX is to do background operations without refreshing the page. The question on what to use is around usability - not performance.

If you are going to stay on the same page but need to send (and receive) data from the server then AJAX is the way you do it. If you are going to end up re-rendering the page after sending data to the server then there is not much motivation for using AJAX

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How can I implement AntiForgeryToken and ValidationMessageFor using jQuery? Do you have a sample ?
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How can I implement AntiForgeryToken and ValidationMessageFor using jQuery? Do you have a sample ?

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There are any gain of performance or other advantages to do my POST request using ajax jQuery instead of do this requests using Html.BeginForm with a button to submit this request to server?
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There are any gain of performance or other advantages to do my POST request using ajax jQuery instead of do this requests using Html.BeginForm with a button to submit this request to server?

Performance  Html.BeginForm vs jQuery

jQuery (Core) is a cross-browser JavaScript library that provides abstractions for common client-side tasks such as Document Object Model (DOM) traversal, DOM manipulation, event handling, animation and Ajax. jQuery also provides a platform to create plugins that extend jQuery's capabilities beyond those already provided by the library.

jQuery

Asynchronous JavaScript and XML (AJAX) is a group of interrelated Web development techniques used on the client-side to create asynchronous Web applications. With AJAX, web applications can send data to and retrieve from a server asynchronously (in the background) without interfering with the display and behavior of the existing page. HTML and CSS can be used in combination to mark up and style information. The Document Object Model (DOM) is accessed with JavaScript to dynamically display and allow interaction with the information presented.

AJAX

C# is an object-oriented programming language created in conjunction with Microsoft’s .NET framework. Compilation is usually done into the Microsoft Intermediate Language (MSIL), which is then JIT-compiled to native code (and cached) during execution in the Common Language Runtime (CLR).

Microsoft’s ASP.NET MVC is a web application framework that implements the model–view–controller (MVC) pattern. As an open-source software, it’s set apart from the ASP.NET Web Forms component, which is proprietary.