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Interlocked.Exchange Method (IntPtr%, IntPtr)

Sets a platform-specific handle or pointer to a specified value and returns the original value, as an atomic operation.

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

public static IntPtr Exchange(
	ref IntPtr location1,
	IntPtr value


Type: System.IntPtr%

The variable to set to the specified value.

Type: System.IntPtr

The value to which the location1 parameter is set.

Return Value

Type: System.IntPtr
The original value of location1.


The address of location1 is a null pointer.

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

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