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CountdownEvent.Signal Method (Int32)

Registers multiple signals with the CountdownEvent, decrementing the value of CurrentCount by the specified amount.

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

public bool Signal(
	int signalCount


Type: System.Int32
The number of signals to register.

Return Value

Type: System.Boolean
true if the signals caused the count to reach zero and the event was set; otherwise, false.


The current instance has already been disposed.


signalCount is less than 1.


The current instance is already set. -or- Or signalCount is greater than CurrentCount.

.NET Framework

Supported in: 4

.NET Framework Client Profile

Supported in: 4

Windows 7, Windows Vista SP1 or later, Windows XP SP3, 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.