Article:		Using the New Callback Manager in ASP.NET 2.0
Subject:		CallBack
Date:		2006-08-02 10:36:27
From:		10SNE1
Do you have this code for C#. I'm having trouble converting the VB code to C# Interface Programming. Thanks

Showing messages 1 through 1 of 1.

• CallBack
  2006-10-13 02:05:10  RohanDcosta [View]
  
  
  gotta implement 2 methods not one since
  The signature of ICallbackEventHandler is:
  interface ICallbackEventHandler
  {
  void RaiseCallbackEvent (string eventArgument);
  string GetCallbackResult ()
  }
  
  The definition of ICallbackEventHandler itself has changed before it had a final shape in the final release. Here is the old definition of ICallbackEventHandler:
  interface ICallbackEventHandler
  {
  string RaiseCallbackEvent(string eventArgument);
  }
  
  
  
  string ICallbackEventHandler.GetCallbackResult()
  {
  return CallbackResult;
  }
  
  void ICallbackEventHandler.RaiseCallbackEvent(string eventArgument)
  {
  //throw new Exception("The method or operation is not implemented.");
  //switch(eventArgument.StartsWith("1:"))
  switch (eventArgument.Substring(0, 2))
  {
  case "1:":
  {
  eventArgument = eventArgument.Substring(2);
  switch (eventArgument)
  {
  case "95472": CallbackResult = "Sebastopol,CA";
  break;
  case "02140": CallbackResult = "Cambridge,MA";
  break;
  default: CallbackResult = "ZipCode not valid.";
  break;
  //default: return "ZipCode not valid.";
  }
  }
  break;
  case ("2:"):
  {
  eventArgument = eventArgument.Substring(2);
  switch (eventArgument)
  {
  case "Sing": CallbackResult = "Singapore,";
  break;
  case "US": CallbackResult = "Alabama,California,Maryland,Massachusetts,New York,Oklahoma,Wisconsin,";
  break;
  case "UK": CallbackResult = "Birmingham,Cambridge,Christchurch,Leeds,Sheffield,";
  break;
  default: CallbackResult = "ZipCode not valid."; break;
  }
  }
  break;
  default: CallbackResult = "case cannot be recognized"; break;
  }
  }
  
  ------SCRIPTS--------------
  function GetStateFromZip()
  {
  //alert('hit GetStateFromZip');
  //debugger;
  var command = "1:"+document.form1.elements("txtPinCode").value;
  var context = new Object();
  context.CommandName = "GetStateFromZip";
  <%=CAllbackString%>;
  }
  function GetStatesFromServer()
  {
  //alert('hit GetStateFromZip');
  //debugger;
  var command = "2:"+document.form1.elements('ddlCountry').value
  var context = new Object();
  context.CommandName = "GetStatesFromCountry";
  <%=CAllbackString%>;
  }
  function ClientCallBackHandler(result,context)
  {
  //alert('hit ClientCallBackHandler');
  debugger;
  if(context.CommandName == "GetStateFromZip")
  {
  var indexOfComma = result.indexOf(",");
  var City = result.substring(0,indexOfComma);
  var State = result.substring(indexOfComma+1,result.length);
  document.form1.elements("txtState").value = State;
  document.form1.elements("txtCity").value = City;
  }
  else
  {
  if(context.CommandName == "GetStatesFromCountry")
  {
  var indexOfComma = 0;
  document.form1.elements("ddlState").options.length = 0;
  while((result.length > 0) && (indexOfComma != -1))
  {
  indexOfComma = result.indexOf(",");
  var State = result.substring(0,indexOfComma);
  result = result.substring(indexOfComma+1);
  opt = new Option(State,State);
  document.form1.elements("ddlState").add(opt);
  }
  }
  }
  }
  function OnError(message,context)
  {
  alert("Exception :-" + message);
  }
  ---------
  HAve Fun :)