You may find that you need to pass variables from one page to the next, and one of the easiest ways to do this is through the use of a "querystring".

What is a "querystring"? 

A querystring is a method of the "Response" object that includes variable names and values that can be passed via a link or Response.Redirect from one ASP page to another.  I.E.:

a href="nextpage.asp?id=<%=ReportID %>"

OR

response.redirect "nextpage?id=" & ReportID

This is very helpful if you don't have a form in your current page to pass "hidden" information from it to another page.

What are the rules?

• If using a "response.redirect" for passing variables make sure your Buffers are set to TRUE
  
  If you are going to use the "response.redirect" method to pass variables from one page to the next, make sure you turn your buffers on in the page that contains the "response.redirect" method.  You do this by adding the following code to the top of your page (above any other ASP code):
  
  Response.Buffer = TRUE 
  
  
• Limit the number of passed variables 
  
  Recently I was working on a site that needed to pass a great number of variables from one page to the next.  And for the first time I received a VERY ugly error message that had me totally baffled until I realized that my "response.redirect" string was TOO long!  The error message was something like:
  
  "Page not found"
  
  And in the address bar in place of the page name I was passing the variables to was the word "failed".  
  
  The only solution I could find, since I absolutely needed to pass all these variables, was to assign them to "Session" variables.  In other words I took them out of my "response.redirect" string and placed them in a Session.  I.E.
  
  Session("ReportID")
  
  And this way the values in the variables were available for use in subsequent pages until they would be overwritten when assigned again.  (The only thing about using Session variables is that you need to make sure your Session does not time-out before they have a chance to be used by the next page.  If you think it is possible that your Session might time-out, set your Session timeout to a longer time than the default (20 minutes).  You do this by adding the following code to your home page or to your Global.asa"
  
  Session.Timeout = 60
  
  The "60" is 60 minutes.  You can set it to whatever length you think is necessary.