Microsoft KB Archive/173317

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Knowledge Base

PRB: Active Server Pages' Request.Form and Request.QueryString Return Objects

Article ID: 173317

Article Last Modified on 5/2/2006


  • Microsoft Active Server Pages 4.0
  • Microsoft Internet Information Server 4.0
  • Microsoft Internet Information Services 5.0

This article was previously published under Q173317


The values that are returned by Request.Form and Request.QueryString are objects, rather than strings as you would expect. This causes subtle conversion problems in server-side scripts, and especially in JScript.


The following call evaluates to TRUE:

   <% IsObject(Request.Form("Valid_Form_Value")) %>

This is because the Request object returns an IRequestDictionary object rather than a string. In most cases, this subtle fact goes unnoticed because the scripting engine simply substitutes the default value of the object into scripts as necessary. The following example demonstrates what happens when you assign the requested value to a variable:

   <% MyValue = Request.QueryString("Valid_QueryString_Value") %>

However, this subtlety causes problems in some scenarios. In particular, it may be necessary to perform explicit casts in JScript or when calling automation methods on objects.

Another option is to use the .item syntax to extract the default value of the object. The following IsObject call evaluates to FALSE and demonstrates use of the .item syntax:

   <% IsObject (Request.QueryString("Valid_Form_Value").item) %>


For the latest Knowledge Base articles and other support information on Visual InterDev and Active Server Pages, see the following Microsoft Technical Support Web site:

Keywords: kbscript kbprb KB173317