asp.net ajax post XML object throws 500 error resolution (client string vs. Xml object)

Ajax is all called "Asynchronous JavaScript and XML" (Asynchronous JavaScript and XML), a Web development technology that creates interactive Web applications.

Where asynchronous represents Asynchrony,

In addition, JavaScript and XML are nouns.

Where JavaScript is used as a client script

Ajax's main idea is to request server scripts asynchronously (synchronously) through XMLHttpRequest objects. The server returns to the client via Response.Write () after receiving the request.

var xmlHttp; To be defined as global

Create an XML request

function Createxmlhttprequest () {

try {xmlHttp = new ActiveXObject ("Msxml2.xmlhttp");       The catch (_e) {try {xmlHttp = new ActiveXObject ("Microsoft.XMLHTTP"); catch (_e) {}} if (!xmlhttp && typeof xmlhttprequest!= ' undefined ') {try {xmlHttp = new     XMLHttpRequest ();     catch (e) {xmlHttp = false; }     }}

Client through Xmlhttp.responsetext

or Xmlhttp.respnsexml

To get the value returned by the server side. So the result of the server-side return is a normal string. Another is the format of the XML text string in this way not to speak (online search a large)

This main introduction returns XML:

one point to declare: whether XML or plain text is routed as a string!!!!!! but it is necessary to deserialize these formatted XML characters when receiving at both ends (converting strings to XML objects)

A concrete example is given below: The XMLHttpRequest object has been declared

var obj = null; function Initxdom (xmlText) {if (typeof (Domparser)!= "undefined") {//Gecko, Mozil                LA, Firefox var parser = new Domparser ();              obj = parser.parsefromstring (XmlText, "text/xml"); }</