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ASP QueryString Collection

The QueryString collection is used to retrieve the variable values in the HTTP query string.

The HTTP query string is specified by the values following the question mark (?), like this:

<a href= "test.asp?txt=this is a query string test">Link with a query string</a>

The line above generates a variable named txt with the value "this is a query string test".

Query strings are also generated by form submission, or by a user typing a query into the address bar of the browser.

Note: If you want to send large amounts of data (beyond 100 kb) the Request.QueryString cannot be used.

Request.QueryString(variable)[(index)|.Count]

Parameter	Description
variable	Required. The name of the variable in the HTTP query string to retrieve
index	Optional. Specifies one of multiple values for a variable. From 1 to Request.QueryString(variable).Count

Example 1

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

The following request is sent:

http://www.w3schools.com/test/names.asp?n=John&n=Susan

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:

John
Susan

Example 2

The following string might be sent:

http://www.w3schools.com/test/names.asp?name=John&age=30

this results in the following QUERY_STRING value:

name=John&age=30

Now we can use the information in a script:

Hi, <%=Request.QueryString("name")%>. 
Your age is <%= Request.QueryString("age")%>.

Output:

Hi, John. Your age is 30.

If you do not specify any variable values to display, like this:

Query string is: <%=Request.QueryString%>

the output would look like this:

Query string is: name=John&age=30

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