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CountdownEvent.TryAddCount Method (Int32)

Attempts to increment CurrentCount by a specified value.

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

public bool TryAddCount(
	int signalCount


Type: System.Int32
The value by which to increase CurrentCount.

Return Value

Type: System.Boolean
true if the increment succeeded; otherwise, false. If CurrentCount is already at zero this will return false.


The current instance has already been disposed.


signalCount is less than or equal to 0.


The current instance is already set.


CurrentCount + signalCount is equal to or greater than MaxValue.

.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.