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ServiceReference Class

Registers a Web service for use in a Web page.

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

[AspNetHostingPermissionAttribute(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal)]
[AspNetHostingPermissionAttribute(SecurityAction.LinkDemand, Level = AspNetHostingPermissionLevel.Minimal)]
public class ServiceReference

To call Web service methods from ECMAScript (JavaScript), you must include a service reference in the ASP.NET page and apply the ScriptServiceAttribute attribute to the Web service class definition. If you include a service reference to a Web service in the ScriptManager or ScriptManagerProxy control inside the ASP.NET page, JavaScript objects will be instantiated in the browser.

The proxy objects will be used to do the following:

  • Make asynchronous requests in JavaScript to Web service methods,

  • Initialize instances of proxies of server data types, in particular for use as input parameters for invoking Web methods.


The ServiceReference control can only be used for services in the same domain.

You can define the Web service location declaratively by adding an <asp:ServiceReference> element to the <Services> element inside the <asp:ScriptManager> element on the page, and then setting its Path attribute, as shown in the following example.

<asp:ScriptManager runat="server" ID="scriptManager">
    <asp:ServiceReference Path="~/WebServices/SimpleWebService.asmx" />

You might use the InlineScript property to indicate whether the proxy generation script is included in the page as an inline script block or is obtained by a separate request.

You can also programmatically add a ServiceReference object through the ScriptManager.Services or ScriptManagerProxy.Services collection by using the Add method of the ServiceReferenceCollection class.

The following example demonstrates how to add a reference to a Web service in the page markup to call the Web service methods from script.

<%@ Page Language="C#" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">

    <head id="Head1" runat="server"> 
        <style type="text/css">
            body {  font: 11pt Trebuchet MS;
                    font-color: #000000;
                    padding-top: 72px;
                    text-align: center }

            .text { font: 8pt Trebuchet MS }
        <title>Calling Web Methods</title>    

        <form id="Form1" runat="server">

            <asp:ScriptManager runat="server" ID="scriptManagerId">
                    <asp:ScriptReference Path="Scripts.js" />
                    <asp:ServiceReference  Path="WebService.asmx" />

                <h2>Calling Web Methods</h2>

                    <tr align="left">
                        <td>Method that does not return a value:</td>
                            <!-- Getting no retun value from 
                            the Web service. --> 
                            <button id="Button1"  
                                onclick="GetNoReturn()">No Return</button>

                    <tr align="left">
                        <td>Method that returns a value:</td>
                            <!-- Getting a retun value from 
                            the Web service. --> 
                            <button id="Button2" 
                                onclick="GetTime(); return false;">Server Time</button>

                   <tr align="left">
                        <td>Method that takes parameters:</td>
                            <!-- Passing simple parameter types to 
                            the Web service. --> 
                            <button id="Button3" 
                                onclick="Add(20, 30); return false;">Add</button>


                    <tr align="left">
                        <td>Method that returns XML data:</td>
                             <!-- Get Xml. --> 
                            <button id="Button4" 
                                onclick="GetXmlDocument(); return false;">Get Xml</button>
                    <tr align="left">
                        <td>Method that uses GET:</td>
                             <!-- Making a GET Web request. --> 
                            <button id="Button5" 
                                onclick="MakeGetRequest(); return false;">Make GET Request</button>




            <span id="ResultId"></span>




Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 7, Windows Vista, Windows XP SP2, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003

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

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