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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.web.services.webmethodattribute below:

WebMethodAttribute Class (System.Web.Services) | Microsoft Learn

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.

public ref class WebMethodAttribute sealed : Attribute

[System.AttributeUsage(System.AttributeTargets.Method)]
public sealed class WebMethodAttribute : Attribute

[<System.AttributeUsage(System.AttributeTargets.Method)>]
type WebMethodAttribute = class
    inherit Attribute

Public NotInheritable Class WebMethodAttribute
Inherits Attribute

Inheritance

Attributes

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",
       EnableSession=true)]
       public string GetMachineName() {
          return Server.MachineName;
       }
    }

<%@ WebService Language="VB" Class="Util"%>

Imports System
Imports System.Web.Services

Public Class Util
    Inherits WebService
    
    Public Function GetUserName() As String
        Return User.Identity.Name
    End Function    
    
    <WebMethod(Description := "Obtains the Server Machine Name", _
        EnableSession := True)> _
    Public Function GetMachineName() As String
        
        Return Server.MachineName
    End Function
End Class

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.

Gets or sets whether the response for this request is buffered.

Gets or sets the number of seconds the response should be held in the cache.

A descriptive message describing the XML Web service method.

Indicates whether session state is enabled for an XML Web service method.

The name used for the XML Web service method in the data passed to and returned from an XML Web service method.

Indicates the transaction support of an XML Web service method.

When implemented in a derived class, gets a unique identifier for this Attribute.

Maps a set of names to a corresponding set of dispatch identifiers.

Retrieves the type information for an object, which can be used to get the type information for an interface.

Retrieves the number of type information interfaces that an object provides (either 0 or 1).

Provides access to properties and methods exposed by an object.

• TransactionOption
• WebService

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