How to use Ajax in ASP. NET

The format for applying Ajax in ASP. NET is as follows:

Foreground code (with JQuery library)

$.ajax({
 　　 type: "POST",
 　　 async: true,
 　　 url: "../Ajax/ajax.ashx",
 　　 dataType: "html",
 　　 data: null
 　　 success: function (result) 
 　　 {
 　　 //do successful sth
 　　 },
 　　 error: function (XMLHttpRequest, textStaus, errThrown) 
 　　 {
 　　 //do error sth
 　　 }
})

The code in Ajax (1 generality handler) is as follows:

public void ProcessRequest (HttpContext context) 
{
context.Response.ContentType = "text/plain";
string result = "Hello World";
context.Response.Write(result);
}

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