Listing 1

  //SERVER
  #region ICallbackEventHandler Members

  private string _strCallbackData = null;

  public void RaiseCallbackEvent(String event Argument)
  {
    _strCallbackData = eventArgument;
  }

  public string GetCallbackResult()
  {
    //TODO: Modify data here
    return _strCallbackData + " modified at Callback " + DateTime.Now.ToString();
  }

  #endregion


Listing 2

//SERVER
  protected void Page_Load(object sender, EventArgs e)
  {
    SetupAlways();
  }

  private void SetupAlways()
  {
    //setup callbacks:
    string cbReference =
    Page.ClientScript.GetCallbackEventReference(
        this,
        "arg",
        "ReceiveCallback",
        "context");
    string callbackScript = "function CallServer
	(arg, context)" + "{ " + cbReference + "} ;";
    Page.ClientScript.RegisterClientScriptBlock(
        this.GetType(),
        "CallServer",
        callbackScript,
        true);
  }


Listing 3

  //CLIENT
  function StartCallback()
  {
    //TODO: assemble the data to send to the callback
    var strData = "user input data here";
    CallServer(strData, "");
  }

  function ReceiveCallback(strReturnData)
  {
    //TODO: use the data that you gte back from the callback.
    document.getElementById("Span1").innerHTML = strReturnData;
  }


Listing 4

public class EmployeeData
  {
    public int Id;
    public string Name;
  }


Listing 5

public static object DeserializeFromXmlString(
    System.Type t, string strXml)
  {
    // Requires namespaces:
    //  using System.IO;
    //  using System.Xml.Serialization;

    XmlSerializer x = null;
    StringReader sr = null;
    try
    {
      sr = new StringReader(strXml);
      x = new XmlSerializer(t);
      return x.Deserialize(sr);
    }
    finally
    {
      if (sr != null)
        sr.Close();
    }
  }


Listing 6

var strData = "<EmployeeData>"
      + "<Id>" + myID + "</Id>"
      + "<Name>" + myName + "</Name>"
      + "</EmployeeData>";


Listing 7

EmployeeData emp = (EmployeeData)Utilities.DeserializeFromXmlString(
      typeof(EmployeeData),
      strXml);