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HttpRequest.QueryString Property

Gets the collection of HTTP query string variables.

Namespace:  System.Web
Assembly:  System.Web (in System.Web.dll)

public NameValueCollection QueryString { get; }

Property Value

Type: System.Collections.Specialized.NameValueCollection
Query string variables sent by the client. Keys and values are URL-decoded.

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 null.

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.

string fullname1 = Request.QueryString["fullname"];
string fullname2 = Request["fullname"];

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1
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