You can find the Query String by using request.getQueryString() 

So you could do:
<% if (request.getQueryString() == null){
       out.println("nothing is passed");
         }
     else
     {
       out.println("Something is passed");
     }
 %>

-----Original Message-----
From: Manish Mandelia [mailto:mmandelia@y...]
Sent: Wednesday, February 28, 2001 3:29 PM
To: Pro_JavaServer_Pages
Cc: preetisikri@h...
Subject: [pro_jsp] Re: how to check QueryString


replace QuesryString with
request.getParameter("variablenamebeingpassedin")




--- Preeti <preetisikri@h...> wrote:
> hey guys 
> I have a JSP page in which I'm refreshing the same
> page and when I refresh I pass some value so now can
> anybody tell how can I check if the QueryString has
> something or not : 
> 
> I wanna do something like this : --
> 
> <% if (QueryString=null){
>       out.print("nothing is passed");
>         }
>     else
>     {
>       out.print("Something is passed");
>     }
> %>
> 
> Help Guys 
> Regards Preeti 
>