Web Development

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[WebMethod]

public static

[WebMethod]
[System.Web.Script.Services.ScriptMethod(ResponseFormat = System.Web.Script.Services.ResponseFormat.Xml)]
public DataTable someMethod(string param)
{
     DataSet dsReturn;
 
     try
     {
          // do your database stuff

          // I like to name the table so that it makes parsing it in jQuery easier for me
          dsReturn.Tables[0].TableName = "someName";
     }
     catch (Exception)
     {
          // do your error handling
          throw;
     }
 
     return dsReturn.Tables[0];
}

$.ajax(...)

$.ajax({
     type: 'POST',
     url: 'location/name.asmx/someMethod',
     data: "{ 'param': 'paramValue' }",
     contentType: 'application/json; charset=utf-8',
     dataType: 'xml',
     success: function (xml) {
          // parse and loop through the records in the datatable
          $('someName', xml).each(function() {
               // your this pointer actually is a record in your datable 
               $(this).find('ColumnName').text();
          });
     },
     error: function(err) {
           // do your jQuery error handling here
     }
});