System.ComponentModel.AsyncOperation.OperationCompleted C# (CSharp) Method

        public void OperationCompleted()
        {
            VerifyNotCompleted();
            OperationCompletedCore();
        }

        public WaitHandle RunAsync()
        {
            if (isRunning)
                throw new InvalidOperationException("Import is already running");

            try {
                /* must be set (as soon as possible) in a function that is _not_ called asynchronously
                 * (i.e. dont call it in ImportThread()) */
                isRunning = true;
                importSucceeded = false;
                cancellationRequested = false;
                asyncOperation = AsyncOperationManager.CreateOperation(null);

                Reset();

                /* invoke the import function on a new thread and return a waithandle */
                Action<string, VolumeDatabase, string, int> it = ImportThread;
                IAsyncResult ar = it.BeginInvoke(sourceDbPath, targetDb, dbDataPath, bufferSize, null, null);
                return ar.AsyncWaitHandle;

            } catch (Exception) {
                isRunning = false;

                if (asyncOperation != null)
                    asyncOperation.OperationCompleted();

                throw;
            }
        }