how to trigger dropdown onchange event using javascript

document.forms[0].elements['dropdownid'].onchange();

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How to check whether Internet connection is avaialable or not

using System.Net;

WebRequest objWebReq;
   WebResponse objResp;
   public Boolean IsConnectionAvailable()
   {
       System.Uri objUrl = new System.Uri("http://www.google.com/");
     
       objWebReq = WebRequest.Create(objUrl);
      
       try
       {
           objResp = objWebReq.GetResponse();
           objResp.Close();
           objWebReq = null;
           return true;
       }
       catch (Exception ex)
       {
           objResp.Close();
           objWebReq = null;
           return false;
       }
   }