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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: 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

Windows Phone 8.1, Windows Phone 8, Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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