Permissions

Type	Reason
System.Security.Permissions.SecurityPermission	Requires permission to call unmanaged code. See System.Security.Permissions.SecurityPermissionFlag.UnmanagedCode .

Exceptions

Type	Reason
InvalidOperationException	The handle has already been freed or was never initialized.

Remarks

The caller is required to provide synchronization to prevent multiple threads from executing this method simultaneously for a given handle.

Requirements

Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)
Assembly Versions: 1.0.5000.0, 2.0.0.0