Assembly: mscorlib (in mscorlib.dll)
You can use FreeCoTaskMem to free any memory allocated by AllocCoTaskMem, ReAllocCoTaskMem, or any equivalent unmanaged API. If the ptr parameter is a null reference (Nothing in Visual Basic), the method does nothing.
FreeCoTaskMem exposes the CoTaskMemFree COM API function, which frees all bytes so that you can no longer use the memory pointed to by the ptr parameter. For additional information about CoTaskMemFree, see the MSDN library.
This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter EditionThe Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.