How to post xml constructed data to webservice and get returned xml as response from asp,net webservice

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I have jquery ajax call to webservice for which i am passing xml parameters as data ,when i run the code the flow is not reaching webservice GetList method at all, can anyone track what may be the problem should i make any changes to my webconfig file or refer any latest jquery file to get the code running sucessfully

$.ajax({
type: "POST",
async: false,
url: "/blkseek2/JsonWebService.asmx/GetList",
datatype:"xml",
data:"<?xml version='1.0'?><keyword1>"+keyword1+ "</keyword1><streetname>"+address1+ "</streetname><lat>"+lat+"</lat><lng>"+lng+ "</lng><radius>"+radius+"</radius>" ,
contentType: "application/xml; charset=utf-8",
// processData: false,
failure: function(XMLHttpRequest, textStatus, errorThrown)
{ ajaxError(XMLHttpRequest,textStatus, errorThrown); },
success: function(xml)
{ ajaxFinish(xml); }
});
});



This will be webmethod on webservice file .


[WebMethod]
[ScriptMethod(ResponseFormat = ResponseFormat.Xml)]


public XmlDocument GetList(string keyword1, string streetname, string lat, string lng, string radius)
{
XmlDocument xmldoc= CreateXML( keyword1,streetname,lat,lng,radius);


return xmldoc;

}