Getting list item using sharepoint web service GetListItems

public void getListData()

{

    WS_Lists.Lists myservice = new WS_Lists.Lists();

    myservice.Credentials = System.Net.CredentialCache.DefaultCredentials;

    myservice.Url = "http://merdev-moss:5050/testsara/_vti_bin/Lists.asmx";

    try

    {

        /* Assign values to pass the GetListItems method*/

        string listName = "{5C65CB1A-2E1B-488A-AC07-B115CD0FC647}";

        string viewName = "{75E689B4-5773-43CB-8324-58E42E1EB885}";

        string rowLimit = "100";

 

        // Instantiate an XmlDocument object

        System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();

        System.Xml.XmlElement query = xmlDoc.CreateElement("Query");

        System.Xml.XmlElement viewFields = xmlDoc.CreateElement("ViewFields");

        System.Xml.XmlElement queryOptions = xmlDoc.CreateElement("QueryOptions");

 

        /*Use CAML query*/

        query.InnerXml = "<Where><Gt><FieldRef Name=\"ID\" />" +

        "<Value Type=\"Counter\">0</Value></Gt></Where>";

        viewFields.InnerXml = "<FieldRef Name=\"Title\" />";

        queryOptions.InnerXml = "";

 

        System.Xml.XmlNode nodes = myservice.GetListItems(listName, viewName, query, viewFields, rowLimit, null, null);

 

        foreach (System.Xml.XmlNode node in nodes)

        {

            if (node.Name == "rs:data")

            {

                for (int i = 0; i < node.ChildNodes.Count; i++)

                {

                    if (node.ChildNodes[i].Name == "z:row")

                    {

                        Response.Write(node.ChildNodes[i].Attributes["ows_Title"].Value + "</br>");

                    }

                }

            }

        }

    }

    catch (Exception ex)

    {

        Response.Write(ex.Message);

    }

}