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WebMethodAttribute Constructor (Boolean, TransactionOption, Int32)

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
)

Parameters

enableSession
Type: System.Boolean

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

transactionOption
Type: System.EnterpriseServices.TransactionOption

Initializes the transaction support of an XML Web service method.

cacheDuration
Type: System.Int32

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"];
     }
}

.NET Framework

Supported in: 4.5.2, 4.5.1, 4.5, 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

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