FreeCoTaskMem Method
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Marshal.FreeCoTaskMem Method (IntPtr)


Frees a block of memory allocated by the unmanaged COM task memory allocator.

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

public static void FreeCoTaskMem(
	IntPtr ptr


Type: System.IntPtr

The address of the memory to be freed.

You can use FreeCoTaskMem to free any memory allocated by AllocCoTaskMem, ReAllocCoTaskMem, or any equivalent unmanaged method. If the ptr parameter is null, the method does nothing.

FreeCoTaskMem exposes the COM CoTaskMemFree function, which frees all bytes so that you can no longer use the memory that the ptr parameter points to.

In addition to FreeCoTaskMem, the Marshal class provides two other memory-deallocation methods: DestroyStructure and FreeHGlobal.


requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

Universal Windows Platform
Available since 4.5
.NET Framework
Available since 1.1
Portable Class Library
Supported in: portable .NET platforms
Windows Phone Silverlight
Available since 8.0
Windows Phone
Available since 8.1
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