In asp.net garbled code appears when transferring data in ajax format to the aspx page

In asp.net, when transferring data in ajax format to aspx page, there will be some garble. The following is the solution

js:

 
XmlHttp.open("POST", "test.aspx", false); 
XmlHttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded"); 
XmlHttp.send("QueryName=" + escape(Queryname) + "&QuerySex=" +escape(Querysex)); 

In test. aspx in:

 
string QueryName = HttpUtility.UrlDecode(Request.Params["QueryName"]); 
string QuerySex = HttpUtility.UrlDecode(Request.Params["QuerySex"]);