Why we use AJAX controls in asp.net and advantage of AJAX controls

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Senthilkumar · Answer

Hi ASP.Net application work in client/server architecture all the clients will send the request on the server and performance will be key challenge. AJAX is technique to send the asynchrnous request to the server and without any post to the server it can change the port of web page using the Java script/XML/HTML. It is more over technology rather than language. In the web page they will be need to perform small operation like voting in the web page but the click on the asp.net server control it sends the request (posted back on the server) and it renders whole page again the client browser. Even though there is need to change in the small portion of web page. Thats where AJAX need to leverage the request and response. Microsoft designed the AJAX control and it can be used to do operations without postback to the server. The advantages of AJAX over classical web-based applications include: Asynchronous calls — AJAX allows for the ability to make asynchronous calls to a web server. This allows the client browser to avoid waiting for all data to arrive before allowing the user to act once more. Minimal data transfer — By not performing a full postback and sending all form data to the server network utilization is minimized and quicker operations occur. In sites and locations with restricted pipes for data transfer this can greatly improve network performance. Limited processing on the server — Along with the fact that only the necessary data is sent to the server the server is not required to process all form elements. By sending only the necessary data there is limited processing on the server. There is no need to process all form elements process the ViewState send images back to the client or send a full page back to the client. Responsiveness—Because AJAX applications are asynchronous on the client they are perceived to be very responsive. Advantages and Disadvantages of AJAX: http://www.seekdotnet.com/blog/asp-net/advantages-disadvantages-of-asp-net-ajax-hosting/ A JAX control in ASP.Net: http://www.asp.net/ajaxlibrary/AjaxControlToolkitSampleSite/