Gets the collection of HTTP query string variables.
Assembly: System.Web (in System.Web.dll)
The following code example shows two ways to get the value of a query string variable named “fullname”. In each case, if the URL is http://www.contoso.com/default.aspx?fullname=Fadi%20Fakhouri, then the value returned is "Fadi Fakhouri" because the %20 is URL-decoded into a space character. If the URL doesn’t have a fullname query string ID, the returned value would be a null reference (Nothing in Visual Basic).
The first line of code looks for the key “fullname” only in the query string; the second line looks for the key “fullname” in all of the HTTP request collections. For more information about the second line, see Item.