GetWebResourceUrl Method

ClientScriptManager.GetWebResourceUrl Method

Gets a URL reference to a resource in an assembly.

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

public string GetWebResourceUrl(
	Type type,
	string resourceName


Type: System.Type

The type of the resource.

Type: System.String

The fully qualified name of the resource in the assembly.

Return Value

Type: System.String
The URL reference to the resource.


The web resource type is null.


The web resource name is null.

- or -

The web resource name has a length of zero.

The GetWebResourceUrl method returns a URL reference to a resource embedded in an assembly. The returned reference is not URL encoded. Resources can be script files, images, or any static file. You specify the type based on the object that will be accessing the resource.

A Web resource registered with the page is uniquely identified by its type and name. Only one resource with a given type and name pair can be registered with the page. Attempting to register a resource that is already registered does not create a duplicate of the registered resource.

The GetWebResourceUrl method is used in conjunction with the RegisterClientScriptResource method for accessing resources embedded in assemblies. For more information on using resources in applications, see ASP.NET Web Page Resources Overview.

The following code example demonstrates the use of the GetWebResourceUrl method. The type parameter in this example is set to the type of class in the assembly containing the resource. The resourceName parameter is specified with the fully qualified path to the resource, which includes the default namespace.

<%@ Page Language="C#"%>
<%@ Import Namespace="Samples.AspNet.CS.Controls" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" 
<script runat="server">

  public void Page_Load(Object sender, EventArgs e)
    // Define the resource name and type.
    String rsname = "Samples.AspNet.CS.Controls.script_include.js";
    Type rstype = typeof(ClientScriptResourceLabel);

    // Get a ClientScriptManager reference from the Page class.
    ClientScriptManager cs = Page.ClientScript;

    // Write out the web resource url.
    ResourcePath.InnerHtml = cs.GetWebResourceUrl(rstype, rsname);

    // Register the client resource with the page.
    cs.RegisterClientScriptResource(rstype, rsname);

<html xmlns="" >
    <title>ClientScriptManager Example</title>
     <form    id="Form1"
     The web resource path is 
     <span  id="ResourcePath"
     <br />
     <br />
     <input type="text" 
            id="Message" />     
     <input type="button" 
            value="ClientClick" />

The following code example demonstrates how to programmatically apply the WebResourceAttribute metadata attribute to mark the assembly for the resources that will be served. Compile the following class in a class library with a default namespace set to Samples.AspNet.CS.Controls or Samples.AspNet.VB.Controls, depending on what language you are using.

using System;
using System.Web;
using System.Web.UI;
using System.Security.Permissions;

[assembly: WebResource("Samples.AspNet.CS.Controls.script_include.js", "application/x-javascript")]
namespace Samples.AspNet.CS.Controls
	[AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal)]
	public class ClientScriptResourceLabel
		// Class code goes here.


This example requires a JavaScript file named Script_include.js. The .js file is an embedded resource in the assembly that contains the ClientScriptResourceLabel object. If you are using Visual Studio, in the Properties window of the class library project, set Build Action to Embedded Resource when the script file is selected. If you are compiling the library at the command line, use the /resource switch to embed the resource.

function DoClick() {Form1.Message.value='Text from resource script.'}

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

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