problem med ajax call til aspx side

Hej Eksperter!

jeg har en ajax funktion som jeg bruger til at hente data ind i form elementer i forbindelse med redigering af indhold og derefter sende det tilbage, og den virker perfect første gang men anden gang funktionen kaldes fejler den? Fejlen forkommer i c# funktionen og går på at id feltet er tomt men hvis jeg ud skriver min "param" i en alertbox lige før data'en bliver send kan jeg se at id'er indeholder data iform af en int som den skal??  Her er min kode:

ajaxcode + javascript functioner:

var ReceiveReq = GetXmlHttpRequestObject();
var setpostdata = "";


function GetXmlHttpRequestObject() {
    if (window.XMLHttpRequest) {
        return new XMLHttpRequest();
    } else if (window.ActiveXObject) {
        return new ActiveXObject("Microsoft.XMLHTTP");
    } else {

    }
}

function setContent(setdata, add, call) {

    if (receiveReq.readyState == 4 || receiveReq.readyState == 0) {

        receiveReq.open("Post", '/wediadna/wi/ajaxpages/systempagemanager/ajaxcall/ajaxcall_systempagemanager.aspx', true);
        receiveReq.setRequestHeader('Content-Type', 'application/x-www-form-urlencoded');
        receiveReq.onreadystatechange = handleContent;
        var param = setdata;
        alert(param);
        receiveReq.send(param);
}
}

function handleContent() {

if (receiveReq.readyState == 4) {

        var xmldoc = receiveReq.responseXML;

        var message_node = xmldoc.getElementsByTagName("message");
       
        var call_node = message_node[0].getElementsByTagName("call");
       
alert(call_node[0].firstChild.nodeValue);
             
       
    }
}       

function saveform() {
setContent(setPost(), '27-06-2009 20:00:00', 'save');
}

function setPost() {

   
    var InputFields = document.getElementById('content_container_main').getElementsByTagName('INPUT');
   
    var SelectFields = document.getElementById('content_container_main').getElementsByTagName('SELECT');
    var TextFields = document.getElementById('content_container_main').getElementsByTagName('TEXTAREA');
    var RadioFields = document.getElementById('content_container_main').getElementsByTagName('RADIO');
    alert(InputFields + "\n" + SelectFields + "\n" + TextFields + "\n" + RadioFields)
    for (var x = 0; x < InputFields.length; x++) {
   
            setpostdata += "&" + InputFields[x].name + "=" + InputFields[x].value;
    }
 
    for (var x = 0; x < SelectFields.length; x++) {

     
            setpostdata += "&" + SelectFields[x].name + "=" + SelectFields[x].value;
    }
   
    for (var x = 0; x < TextFields.length; x++) {

     
            setpostdata += "&" + TextFields[x].name + "=" + TextFields[x].value;
    }

    for (var x = 0; x < RadioFields.length; x++) {

   
            setpostdata += "&" + RadioFields[x].name + "=" + RadioFields[x].value;
    }


    return setpostdata;

}



aspx siden som kaldes med ajax:
<%@ Page Language="C#"  ValidateRequest="false"%>
<%@ import namespace="System.Xml" %>
<%@ import namespace="MySpace" %>


<script language="C#" runat="server">
void Page_Load(Object sender, EventArgs e)
{
string TheXml = "<?xml version=\"1.0\" encoding=\"utf-8\"?>\n<root>\n<message>\n";

string Call = "";
if (!string.IsNullOrEmpty(Request.QueryString["Call"]))
    {

        Call = Request.QueryString["Call"].ToString();

    }

if(Call == "save"){

TheXml += MySystem.SaveEditContent();

}

TheXml += "\n</message>\n</root>";
    Response.ContentType = "text/xml";
    Response.Write(TheXml);
   
  Response.End();
 
}
</script>TheXml += "\n</message>\n</root>";
    Response.ContentType = "text/xml";
    Response.Write(TheXml);
   
  Response.End();
 
}
</script>

c# funktionen der fejler:

public void SaveEditContent()
            {
                SqlConnection myConnection = new SqlConnection(ConfigurationManager.ConnectionStrings["dbconnect"].ConnectionString);

                SqlCommand command = new SqlCommand("SaveEditContent", myConnection);


                int id = 0;
                if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["id"].ToString()))
                {
                    id = int.Parse(HttpContext.Current.Request.Form["id"].ToString());
                }

                string name = "";
                if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["name"].ToString()))
                {
                    name = HttpContext.Current.Request.Form["name"].ToString();
                }

                int active = 0;
                if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["active"].ToString()))
                {
                    active = int.Parse(HttpContext.Current.Request.Form["active"].ToString());
                }

                string content = "";
                if (!string.IsNullOrEmpty(HttpContext.Current.Request.Form["content"].ToString()))
                {
                    content = HttpContext.Current.Request.Form["content"].ToString();
                }


                command.CommandType = CommandType.StoredProcedure;

                command.Parameters.Add("@id", SqlDbType.Int);
                command.Parameters.Add("@name", SqlDbType.VarChar);
                command.Parameters.Add("@active", SqlDbType.VarChar);
                command.Parameters.Add("@content", SqlDbType.VarChar);
               

                command.Parameters["@id"].Value = @id;
                command.Parameters["@name"].Value = @name;
                command.Parameters["@active"].Value = @active;
                command.Parameters["@content"].Value = @content;
             

                command.Connection.Open();
                command.ExecuteNonQuery();
                command.Connection.Close();

            }