how does Request.QueryString work?

Question

I have a code example like this :

 location.href = location.href + \"/Edit?pID=\" + hTable.getObj().ID; ; //aspx    
 parID = Request.QueryString[\"pID\"];          


        

Answer 1

A query string is an array of parameters sent to a web page.

This url: http://page.asp?x=1&y=hello

Request.QueryString[0] is the same as 
Request.QueryString["x"] and holds a string value "1"

Request.QueryString[1] is the same as 
Request.QueryString["y"] and holds a string value "hello"