WebMethodAttribute.WebMethodAttribute(Boolean, TransactionOption, Int32) Constructor

Initializes a new instance of the WebMethodAttribute class.

Namespace: System.Web.Services
Assembly: System.Web.Services (in system.web.services.dll)

public WebMethodAttribute (
	bool enableSession,
	TransactionOption transactionOption,
	int cacheDuration
public WebMethodAttribute (
	boolean enableSession, 
	TransactionOption transactionOption, 
	int cacheDuration
public function WebMethodAttribute (
	enableSession : boolean, 
	transactionOption : TransactionOption, 
	cacheDuration : int
Not applicable.



Initializes whether session state is enabled for the XML Web service method.


Initializes the transaction support of an XML Web service method.


Initializes the number of seconds the response is cached.

A web service call can only be the root of a transaction, due to the stateless nature of the HTTP protocol. This means that the following two settings are equivalent, with each call creating a new transaction:

[WebMethod(TransactionOption = TransactionOption.Required)]
[WebMethod(TransactionOption = TransactionOption.RequiresNew)]

It also means that all the following settings are equivalent; meaning no transaction support:

[WebMethod] // TransactionOption.Disabled is the default
[WebMethod(TransactionOption = TransactionOption.Disabled)]
[WebMethod(TransactionOption = Transaction.NotSupported)]
[WebMethod(TransactionOption = Transaction.Supported)]

<%@ WebService Language="C#" Class="Counter" %>
<%@ assembly name="System.EnterpriseServices,Version=1.0.3300.0,Culture=neutral,PublicKeyToken=b03f5f7f11d50a3a" %>

using System.Web.Services;
using System;
using System.Web;
using System.EnterpriseServices;

public class Counter : WebService {
     [ WebMethod(true,TransactionOption.NotSupported,60) ]
     public int ServiceUsage() {
          // If the XML Web service has not been accessed, initialize it to 1.
          if (Application["MyServiceUsage"] == null) {
              Application["MyServiceUsage"] = 1;
          else {
              // Increment the usage count.
              Application["MyServiceUsage"] = ((int) Application["MyServiceUsage"]) + 1;

          // Return the usage count.     
          return  (int) Application["MyServiceUsage"];

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0