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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
A NameValueCollection containing the collection of query string variables sent by the client. For example, If the request URL is http://www.contoso.com/default.aspx?id=44 then the value of QueryString is "id=44".

The following code example accepts the query string from a client form (with a GET method attribute) and writes out the names and values of each named input element on the form. Place this code on the ASP.NET page referenced by the form's ACTION attribute.

int loop1, loop2;

// Load NameValueCollection object.
NameValueCollection coll=Request.QueryString; 
// Get names of all keys into a string array.
String[] arr1 = coll.AllKeys; 
for (loop1 = 0; loop1 < arr1.Length; loop1++) 
{
   Response.Write("Key: " + Server.HtmlEncode(arr1[loop1]) + "<br>");
   String[] arr2 = coll.GetValues(arr1[loop1]);
   for (loop2 = 0; loop2 < arr2.Length; loop2++) 
   {
      Response.Write("Value " + loop2 + ": " + Server.HtmlEncode(arr2[loop2]) + "<br>");
   }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

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

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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