title: JQuery Ajax 500 Internal Error
body: <p>I'm just starting to use the JQuery library so bear with me if I am missing something obvious. I have a webserivce with a couple of test methods...</p>
  
  <pre><code>[WebService(Namespace = "http://localhost/WebServices")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  // To allow this Web Service to be called from script, using ASP.NET AJAX, uncomment the following line. 
  [System.Web.Script.Services.ScriptService]
  public class SystemServices : BaseWebService
  {
      [WebMethod(EnableSession = true)]
      public string GetDate()
      {
          return DateTime.Today.ToShortDateString();
      }
      [WebMethod(EnableSession = true)]
      public string PerformPISearch(string firstName, string lastName )
      {
          return firstName + lastName;
      }
  </code></pre>
  
  <p>I can use the $.ajax request to use the GetDate method which does not have parameters with no issue, but I get the 500 Internal Server Error returned from jQuery when I try to run the PerformPISearch method (the web service constructor never gets hit)...So I am assuming I am doing something wrong with the way I am trying to pass the paramters to the method, but I can't figure out what...</p>
  
  <pre><code>     function PerformSearch() {
       var strFirstName = (txtFirstName.GetValue() == null ? "" : txtFirstName.GetValue());
       var strLastName = (txtLastName.GetValue() == null ? "" : txtLastName.GetValue());
       var webserviceURL = '&lt;%= WebServiceURL %&gt;'
  
       $.ajax({
           type: "POST",
           url: webserviceURL + "SystemServices.asmx/PerformPISearch", //Can change to use GetDate and it works.
           data: ({firstName: strFirstName, lastName: strLastName}), //thinking the problem is here
           contentType: "application/json; charset=utf-8",
           dataType: "json",
           success: function(msg) {
               AjaxSucceeded(msg);
           },
           error: AjaxFailed
       });
   }
  
   function AjaxSucceeded(result) {
       alert(result.d);
   }
   function AjaxFailed(result) {
       alert(result.status + ' ' + result.statusText);
   }
  </code></pre>