What is QueryString??

Query string is used to transfer small amount of data into one web form to another web form in URL.

Query string is the part of a uniform resource locator (URL) containing data that does not fit conveniently into a hierarchical path structure. The query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML form.

Example:-

To loop through all the n variable values in a Query String:

The following request is sent:

http://www.ProgrammerSolution.com/test/names.asp?n=Ram&n=Shyam

and names.asp contains the following script:

<%
for i=1 to Request.QueryString("n").Count
  Response.Write(Request.QueryString("n")(i) & "<br>")
next
%> 

The file names.asp would display the following:

Ram  

Shyam