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    <p>Example 1: </p> <pre><code>string itsMeString = string.IsNullOrEmpty(Request.QueryString["itsMe"]) ? string.Empty : HttpUtillity.UrlDecode(Request.QueryString["itsMe"]); </code></pre> <p>Stright to your questions:</p> <ol> <li>Not quite sure what do you mean by suffix, if you are asking what happens if the key is not present(you don't have it in the QueryString) - yes it will return null.</li> <li>My GUESS here is that when constructed, Request.QueryString internally calls HttpUtillity.ParseQueryString() method and caches the NameValueCollection for subsequential access. I think the first is only left so you can use it over a string that is not present in the Request, for example if you are scrapping a web page and need to get some arguments from a string you've found in the code of that page. This way you won't need to construct an Uri object but will be able to get just the query string as a NameValueCollection if you are sure you only need this. This is a wild guess ;).)</li> <li>This is implemented on a page level so if you are accessing the QueryString let's say in Page_Load event handler, you are having a valid and safe string (ASP.NET will throw an exception otherwise and will not let the code flow enter the Page_Load so you are protected from storing XSS in your database, the exception will be: "<strong>A potentially dangerous Request.QueryString value was detected from the client</strong>, same as if a post variable contains any traces of XSS but instead Request.Form the exception says Request.QueryString."). This is so if you let the "<strong>validateRequest</strong>" switched on (by default it is). The ASP.NET pipeline will throw an exception earlier, so you don't have the chance to save any XSS things to your store (Database). Switching it off implies you know what you're doing so you will then need to implement the security yourself (by checking what's comming in).</li> <li>Probably it will be safe to say yes. Anyway, since you will in most cases generating the QueryString on your own (via JavaScript or server side code - be sure to use HttpUtillity.UrlEncode for backend code and escape for JavaScript). This way the browser will be forced to turn "It's me!" to "It%27s%20me%21". You can refer to this article for more on Url Encoding in JavaScript: <a href="http://www.javascripter.net/faq/escape.htm" rel="nofollow">http://www.javascripter.net/faq/escape.htm</a>.</li> <li>Please elaborate on that, couldn't quite get what do you mean by "will comma-separate values if more than one is specified.".</li> <li>As far as I remember, none of them will. You will probably need to call HttpUtillity.UrlDecode / HttpUtillity.HtmlDecode (based on what input do you have) to get the string correctly, in the above example with "It's me!" you will do something like (see Example 1 as something's wrong with the code formatting if I put it after the numbered list).</li> </ol>
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    1. PORequest.QueryString[] vs. Request.Query.Get() vs. HttpUtility.ParseQueryString()
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    1. USPavel Donchev
    1. USPavel Donchev
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    1. COYour number 6 is not correct, and your example code could cause over-decoding. If you have URL: `http://site.com/page.aspx?id=%20Hello` then call `Request.QueryString["id"]` the return value will be `" Hello"`, because it automatically decodes.
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      1. USAndrew Barber
    2. COHi, sorry for the delay in responding... I will look at this more tomorrow. Thanks!
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      1. USJames King
    3. COThanks for the info! Sorry to take so long to reply; I gave Andrew credit for some of his specifics, but I upvoted yours. Thanks again!
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      1. USJames King
 

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