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GC.CollectionCount Method

Returns the number of times garbage collection has occurred for the specified generation of objects.

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

public static int CollectionCount(
	int generation


Type: System.Int32
The generation of objects for which the garbage collection count is to be determined.

Return Value

Type: System.Int32
The number of times garbage collection has occurred for the specified generation since the process was started.


generation is less than 0.

If you implement your own resource management, you might need to force garbage collection periodically by calling the Collect method. Because this is an expensive operation, you can improve performance by skipping the call when a garbage collection has occurred recently. Save the value returned by CollectionCount immediately after calling Collect. The next time you need to call Collect, compare the current value returned by CollectionCount to the saved value. If the two values are equal, no collection has occurred in the interim and it is reasonable to call Collect again.

.NET Framework

Supported in: 4, 3.5, 3.0, 2.0

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

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.