System.IO.FileStream.GetLastWin32ErrorAndDisposeHandleIfInvalid C# (CSharp) Method

        private int GetLastWin32ErrorAndDisposeHandleIfInvalid(bool throwIfInvalidHandle = false)
        {
            int errorCode = Marshal.GetLastWin32Error();

            // If ERROR_INVALID_HANDLE is returned, it doesn't suffice to set
            // the handle as invalid; the handle must also be closed.
            //
            // Marking the handle as invalid but not closing the handle
            // resulted in exceptions during finalization and locked column
            // values (due to invalid but unclosed handle) in SQL Win32FileStream
            // scenarios.
            //
            // A more mainstream scenario involves accessing a file on a
            // network share. ERROR_INVALID_HANDLE may occur because the network
            // connection was dropped and the server closed the handle. However,
            // the client side handle is still open and even valid for certain
            // operations.
            //
            // Note that _parent.Dispose doesn't throw so we don't need to special case.
            // SetHandleAsInvalid only sets _closed field to true (without
            // actually closing handle) so we don't need to call that as well.
            if (errorCode == Interop.Errors.ERROR_INVALID_HANDLE)
            {
                _fileHandle.Dispose();

                if (throwIfInvalidHandle)
                    throw Win32Marshal.GetExceptionForWin32Error(errorCode);
            }

            return errorCode;
        }