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	Private static readonly object ReflectionLock = new object();
Lock (ReflectionLock)
{
    Type scriptManagerType =
       Type.GetType(
       "System.Web.UI.ScriptManager, System.Web.Extensions, Version=3.5.0.0, Culture=neutral, PublicKeyToken=31BF3856AD364E35",
       false);
    if (scriptManagerType != null)
        // ASP.NET AJAX is installed.
    else
        // ASP.NET AJAX is not installed.
 
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ScriptManager sm = ScriptManager.GetCurrent(Page)
if (sm == null)
{
    // ASP.NET AJAX functionality is not enabled for the page.
}
else
{
    // AJAX functionality is enabled for the page.
}
 
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index.jsp
<html>
<head>
<style >
 #child{
  color: #333;
  width:200px;
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    using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using AlltripDLL;
public pa ......
	
    
        
    
    
# app\controllers\examples_controller.rb
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class ExamplesController < ApplicationController  
  
  def ajax_select  
    @items = %w{AA BB}  
  end   ......
	
    
        
    
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