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ManualResetEvent Constructor

Updated: March 2011

Initializes a new instance of the ManualResetEvent class with a Boolean value indicating whether to set the initial state to signaled.

Namespace:  System.Threading
Assembly:  mscorlib (in mscorlib.dll)

public ManualResetEvent(
	bool initialState


Type: System.Boolean
true to set the initial state signaled; false to set the initial state to nonsignaled.

If the initial state of a ManualResetEvent is signaled (that is, if it is created by passing true for initialState), threads that wait on the ManualResetEvent do not block. If the initial state is nonsignaled, threads block until the Set method is called.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0, 1.1, 1.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

Portable Class Library

Supported in: Portable Class Library

Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

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




March 2011

Clarified the meaning of signaled and nonsignaled.

Customer feedback.