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SynchronizationAttribute Class

Sets the synchronization value of the component. This class cannot be inherited.

Namespace:  System.EnterpriseServices
Assembly:  System.EnterpriseServices (in System.EnterpriseServices.dll)

[AttributeUsageAttribute(AttributeTargets.Class, Inherited = true)]
public sealed class SynchronizationAttribute : Attribute

Both transaction and just-in-time (JIT) activation enable synchronization automatically.

For more information about using attributes, see Extending Metadata Using Attributes.

Applying SynchronizationAttribute to a context-bound object results in the creation of a wait handle and auto reset event, which are not deterministically garbage collected. Therefore, you should not create a large number of context-bound objects marked with the SynchronizationAttribute within a short time period.

The following code example demonstrates the use of the SynchronizationAttribute type.

using System;
using System.EnterpriseServices;
using System.Reflection;

// References: 
// System.EnterpriseServices 

// This is equivalent to [Synchronization(SynchronizationOption.Required)].
public class SynchronizationAttribute_Ctor : ServicedComponent

public class SynchronizationAttribute_Ctor_SynchronizationOption : ServicedComponent

public class SynchronizationAttribute_Value : ServicedComponent
    public void ValueExample()
        // Get the SynchronizationAttribute applied to the class.
        SynchronizationAttribute attribute =

        // Display the value of the attribute's Value property.
        Console.WriteLine("SynchronizationAttribute.Value: {0}",


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

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