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WebMethodAttribute Class

Adding this attribute to a method within an XML Web service created using ASP.NET makes the method callable from remote Web clients. This class cannot be inherited.

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

public sealed class WebMethodAttribute : Attribute

Methods within a class that have this attribute set are called XML Web service methods. The method and class must be public and running inside an ASP.NET Web application.

Walkthrough: Creating and Using an ASP.NET Web Service in Visual Web DeveloperBuilding ASP .NET Web Applications in Visual Studio

In the example below the method GetMachineName can be remotely called across the Web, because it has a WebMethodAttribute. GetUserName cannot be called remotely, because it does not have a WebMethodAttribute, even though it is public.

<%@ WebService Language="C#" Class="Util"%>
    using System;
    using System.Web.Services;
    public class Util: WebService {
       public string GetUserName() {
          return User.Identity.Name;

       [ WebMethod(Description="Obtains the Server Machine Name",
       public string GetMachineName() {
          return Server.MachineName;


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 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, Windows CE, Windows Mobile for Smartphone, Windows Mobile for Pocket PC

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

.NET Compact Framework

Supported in: 3.5, 2.0, 1.0