# Runtime\_CompilerServices\_INotifyCompletion

***

**1. Implementing INotifyCompletion for Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;

public class MyAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        // Perform asynchronous operation
        IsCompleted = true;
        OnCompleted(() => { /* Do something after operation completes */ });
    }
}
```

**2. Using INotifyCompletion with Async/Await**

```csharp
using System.Runtime.CompilerServices;
using System.Threading.Tasks;

public async Task MyAsyncMethod()
{
    var asyncOperation = new MyAsyncOperation();
    asyncOperation.Start();
    await asyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**3. Implementing INotifyCompletion for Custom Progress Tracking**

```csharp
using System.Runtime.CompilerServices;

public class ProgressAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }
    public float Progress { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void UpdateProgress(float progress)
    {
        Progress = progress;
    }

    public void Start()
    {
        // Perform asynchronous operation while updating progress
        IsCompleted = true;
        OnCompleted(() => { /* Do something after operation completes */ });
    }
}
```

**4. Using INotifyCompletion with Progress Observables**

```csharp
using System.Runtime.CompilerServices;
using System.Reactive.Linq;

public class ObservableAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private IObservable<float> progressObservable;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public IObservable<float> GetProgress()
    {
        return progressObservable;
    }

    public void Start()
    {
        // Perform asynchronous operation while publishing progress
        progressObservable = Observable.Return(0f);
        IsCompleted = true;
        OnCompleted(() => { /* Do something after operation completes */ });
    }
}
```

**5. Implementing INotifyCompletion for Background Worker**

```csharp
using System.ComponentModel;
using System.Runtime.CompilerServices;

public class BackgroundAsyncOperation : BackgroundWorker, INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        RunWorkerCompleted += (_, __) => continuation();
    }

    protected override void OnDoWork(DoWorkEventArgs e)
    {
        // Perform asynchronous operation
        IsCompleted = true;
    }
}
```

**6. Using INotifyCompletion with Background Worker and Progress Events**

```csharp
using System.ComponentModel;
using System.Runtime.CompilerServices;

public class ProgressBackgroundAsyncOperation : BackgroundWorker, INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        RunWorkerCompleted += (_, __) => continuation();
    }

    public event ProgressChangedEventHandler ProgressChanged;

    protected override void OnDoWork(DoWorkEventArgs e)
    {
        // Perform asynchronous operation while raising progress events
        IsCompleted = true;
        ProgressChanged?.Invoke(this, new ProgressChangedEventArgs(100, null));
    }
}
```

**7. Implementing INotifyCompletion for Workflow Engine**

```csharp
using System.Runtime.CompilerServices;

public class WorkflowAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }
    public WorkflowTask[] Tasks { get; set; }

    public WorkflowTask CurrentTask { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        NextTask();
        // Start or resume next task
    }

    public void NextTask()
    {
        CurrentTask = Tasks[CurrentTaskIndex++];
        CurrentTask.Start();
    }
}

public class WorkflowTask
{
    public Action Action { get; set; }

    public void Start()
    {
        // Execute the action and notify workflow when completed
        Action();
        Workflow.OnTaskCompleted();
    }
}
```

**8. Using INotifyCompletion for Parallel Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading.Tasks;

public async Task ParallelAsyncOperation()
{
    var operations = new INotifyCompletion[] { new Operation1(), new Operation2() };

    await Task.WhenAll(operations);

    // All operations are now complete
}

public class Operation1 : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        // Perform asynchronous operation
        IsCompleted = true;
        OnCompleted(() => { /* Do something after operation completes */ });
    }
}

public class Operation2 : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        // Perform asynchronous operation
        IsCompleted = true;
        OnCompleted(() => { /* Do something after operation completes */ });
    }
}
```

**9. Implementing INotifyCompletion for Task-Like Objects**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public class TaskLikeAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private ManualResetEventSlim completionEvent = new ManualResetEventSlim();

    public void OnCompleted(Action continuation)
    {
        completionEvent.Wait();
        continuation();
    }

    public void Start()
    {
        // Perform asynchronous operation
        IsCompleted = true;
        completionEvent.Set();
    }
}
```

**10. Using INotifyCompletion with Task-Like Objects**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public async Task MyAsyncMethod()
{
    var taskLikeOperation = new TaskLikeAsyncOperation();
    taskLikeOperation.Start();
    await taskLikeOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**11. Implementing INotifyCompletion for Event-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public class EventAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private ManualResetEventSlim completionEvent = new ManualResetEventSlim();

    public void OnCompleted(Action continuation)
    {
        completionEvent.Wait();
        continuation();
    }

    public void SignalCompletion()
    {
        IsCompleted = true;
        completionEvent.Set();
    }

    public void Start()
    {
        // Perform asynchronous operation and signal completion when done
    }
}
```

**12. Using INotifyCompletion with Event-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public async Task MyAsyncMethod()
{
    var eventAsyncOperation = new EventAsyncOperation();
    eventAsyncOperation.Start();
    await eventAsyncOperation; // Suspends until SignalCompletion is called
    // Operation is now complete
}
```

**13. Implementing INotifyCompletion for Complex Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public class ComplexAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private ManualResetEventSlim completionEvent = new ManualResetEventSlim();
    private CancellationTokenSource cancellationTokenSource;

    public void OnCompleted(Action continuation)
    {
        completionEvent.Wait();
        continuation();
    }

    public void Start()
    {
        cancellationTokenSource = new CancellationTokenSource();

        // Perform asynchronous operation with cancellation support
        if (cancellationTokenSource.IsCancellationRequested)
            return;

        IsCompleted = true;
        completionEvent.Set();
    }

    public void Cancel()
    {
        cancellationTokenSource.Cancel();
    }
}
```

**14. Using INotifyCompletion with Complex Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public async Task MyAsyncMethod()
{
    var complexAsyncOperation = new ComplexAsyncOperation();
    complexAsyncOperation.Start();
    await complexAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**15. Implementing INotifyCompletion for Multi-Phase Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;

public class MultiPhaseAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public int CurrentPhase { get; private set; }
    public int TotalPhases { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        // Perform first phase
        CurrentPhase++;
        // Raise ProgressChanged event with updated progress
        // Start next phase
    }

    public void NextPhase()
    {
        // Perform next phase
        CurrentPhase++;
        // Raise ProgressChanged event with updated progress
        // Check if last phase is completed, if so, set IsCompleted to true
    }
}
```

**16. Using INotifyCompletion with Multi-Phase Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public async Task MyAsyncMethod()
{
    var multiPhaseAsyncOperation = new MultiPhaseAsyncOperation();
    multiPhaseAsyncOperation.Start();

    // Subscribe to ProgressChanged event to track progress
    multiPhaseAsyncOperation.ProgressChanged += (sender, args) => { /* Update UI or perform other actions based on progress */ };

    await multiPhaseAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**17. Implementing INotifyCompletion for State Machine-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;

public class StateMachineAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private StateMachine stateMachine;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        stateMachine = new StateMachine(this);
        stateMachine.Start();
    }

    public class StateMachine
    {
        private StateMachineAsyncOperation operation;

        public StateMachine(StateMachineAsyncOperation operation)
        {
            this.operation = operation;
        }

        public void Start()
        {
            // Initialize state machine and move to first state
        }

        public void NextState()
        {
            // Move to next state
            // If in final state, set operation.IsCompleted to true
        }
    }
}
```

**18. Using INotifyCompletion with State Machine-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var stateMachineAsyncOperation = new StateMachineAsyncOperation();
    stateMachineAsyncOperation.Start();
    await stateMachineAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**19. Implementing INotifyCompletion for Reactive Extensions (Rx)**

```csharp
using System.Runtime.CompilerServices;
using System.Reactive.Linq;

public class ReactiveAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private IObservable<T> observable;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public IObservable<T> GetObservable()
    {
        return observable;
    }

    public void Start()
    {
        observable = Observable.Create(o =>
        {
            // Perform asynchronous operation and publish results to observer
            IsCompleted = true;
            o.OnCompleted();
        });
    }
}
```

**20. Using INotifyCompletion with Reactive Extensions (Rx)**

```csharp
using System.Runtime.CompilerServices;
using System.Reactive.Linq;

public async Task MyAsyncMethod()
{
    var reactiveAsyncOperation = new ReactiveAsyncOperation();
    reactiveAsyncOperation.Start();

    // Subscribe to observable to consume results
    reactiveAsyncOperation.GetObservable().Subscribe(value => { /* Do something with the result */ });

    await reactiveAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**21. Implementing INotifyCompletion for EventArg-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public class EventArgAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private ManualResetEventSlim completionEvent = new ManualResetEventSlim();

    public void OnCompleted(Action continuation)
    {
        completionEvent.Wait();
        continuation();
    }

    public void SignalCompletion(EventArgs e)
    {
        IsCompleted = true;
        completionEvent.Set();
    }

    public void Start()
    {
        // Perform asynchronous operation and signal completion with event arguments when done
    }
}
```

**22. Using INotifyCompletion with EventArg-Based Asynchronous Operations**

```csharp
using System.Runtime.CompilerServices;
using System.Threading;

public async Task MyAsyncMethod()
{
    var eventArgAsyncOperation = new EventArgAsyncOperation();
    eventArgAsyncOperation.Start();

    // Subscribe to event to receive completion notification with event arguments
    eventArgAsyncOperation.SignalCompletion += (sender, args) => { /* Handle event arguments */ };

    await eventArgAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete
}
```

**23. Implementing INotifyCompletion for Data Binding**

```csharp
using System.Runtime.CompilerServices;
using System.ComponentModel;

public class DataBindingAsyncOperation : INotifyCompletion, INotifyPropertyChanged
{
    public bool IsCompleted { get; private set; }

    public event PropertyChangedEventHandler PropertyChanged;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void UpdateValue(object value)
    {
        IsCompleted = true;
        PropertyChanged?.Invoke(this, new PropertyChangedEventArgs("Value"));
    }

    public void Start()
    {
        // Perform asynchronous operation and update value when complete
    }
}
```

**24. Using INotifyCompletion with Data Binding**

```csharp
using System.Runtime.CompilerServices;
using System.ComponentModel;

public async Task MyAsyncMethod()
{
    var dataBindingAsyncOperation = new DataBindingAsyncOperation();
    dataBindingAsyncOperation.Start();

    // Bind to Value property to receive updates from asynchronous operation
    dataBindingAsyncOperation.PropertyChanged += (sender, args) => { if (args.PropertyName == "Value") { /* Use updated value */ } };

    await dataBindingAsyncOperation; // Suspends until IsCompleted becomes true
    // Operation is now complete and updated value is available
}
```

**25. Implementing INotifyCompletion for Asynchronous Initialization**

```csharp
using System.Runtime.CompilerServices;

public class AsyncInitialization : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public void Start()
    {
        // Perform asynchronous initialization
        IsCompleted = true;
        OnCompleted(() => { /* Initialize dependent objects or properties */ });
    }
}
```

**26. Using INotifyCompletion with Asynchronous Initialization**

```csharp
using System.Runtime.CompilerServices;

public class MyAsyncInitializedClass
{
    private AsyncInitialization initialization;

    public MyAsyncInitializedClass()
    {
        initialization = new AsyncInitialization();
        initialization.Start();
    }

    public async Task InitializeAsync()
    {
        // Wait for initialization to complete
        await initialization;

        // Now the class is fully initialized and ready to use
    }
}
```

**27. Implementing INotifyCompletion for HTTP Requests**

```csharp
using System.Net.Http;
using System.Runtime.CompilerServices;

public class HttpAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private HttpClient client;
    private string url;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<HttpResponseMessage> GetResponseAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await client.GetAsync(url);
    }

    public void Start(HttpClient client, string url)
    {
        this.client = client;
        this.url = url;

        // Perform HTTP request asynchronously
        HttpResponseMessage response = await client.GetAsync(url);
        IsCompleted = true;
        OnCompleted(() => { /* Process response */ });
    }
}
```

**28. Using INotifyCompletion with HTTP Requests**

```csharp
using System.Net.Http;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var httpAsyncOperation = new HttpAsyncOperation();
    httpAsyncOperation.Start(new HttpClient(), "https://example.com");

    await httpAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the HTTP request is complete and you can retrieve the response
    HttpResponseMessage response = await httpAsyncOperation.GetResponseAsync();
}
```

**29. Implementing INotifyCompletion for Database Query**

```csharp
using System.Data.SqlClient;
using System.Runtime.CompilerServices;

public class DbQueryAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private SqlConnection connection;
    private string query;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<SqlDataReader> GetResultsAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await new SqlCommand(query, connection).ExecuteReaderAsync();
    }

    public void Start(SqlConnection connection, string query)
    {
        this.connection = connection;
        this.query = query;

        // Perform database query asynchronously
        SqlDataReader reader = await new SqlCommand(query, connection).ExecuteReaderAsync();
        IsCompleted = true;
        OnCompleted(() => { /* Process results */ });
    }
}
```

**30. Using INotifyCompletion with Database Query**

```csharp
using System.Data.SqlClient;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var dbQueryAsyncOperation = new DbQueryAsyncOperation();
    dbQueryAsyncOperation.Start(new SqlConnection(), "SELECT * FROM MyTable");

    await dbQueryAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the database query is complete and you can retrieve the results
    SqlDataReader reader = await dbQueryAsyncOperation.GetResultsAsync();
}
```

**31. Implementing INotifyCompletion for File I/O**

```csharp
using System.IO;
using System.Runtime.CompilerServices;

public class FileIOAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private string filePath;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<string> ReadAllTextAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await File.ReadAllTextAsync(filePath);
    }

    public void Start(string filePath)
    {
        this.filePath = filePath;

        // Perform file I/O asynchronously
        string text = await File.ReadAllTextAsync(filePath);
        IsCompleted = true;
        OnCompleted(() => { /* Process text */ });
    }
}
```

**32. Using INotifyCompletion with File I/O**

```csharp
using System.IO;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var fileIOAsyncOperation = new FileIOAsyncOperation();
    fileIOAsyncOperation.Start("myFile.txt");

    await fileIOAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the file I/O is complete and you can retrieve the text
    string text = await fileIOAsyncOperation.ReadAllTextAsync();
}
```

**33. Implementing INotifyCompletion for Image Processing**

```csharp
using System.Drawing;
using System.Runtime.CompilerServices;

public class ImageProcessingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private Image image;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<Image> ResizeAsync(int width, int height)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => image.Resize(width, height));
    }

    public void Start(Image image)
    {
        this.image = image;

        // Perform image processing asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Process resized image */ });
    }
}
```

**34. Using INotifyCompletion with Image Processing**

```csharp
using System.Drawing;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var imageProcessingAsyncOperation = new ImageProcessingAsyncOperation();
    imageProcessingAsyncOperation.Start(Image.FromFile("myImage.jpg"));

    await imageProcessingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the image processing is complete and you can retrieve the resized image
    Image resizedImage = await imageProcessingAsyncOperation.ResizeAsync(100, 100);
}
```

**35. Implementing INotifyCompletion for Audio Processing**

```csharp
using System.Media;
using System.Runtime.CompilerServices;

public class AudioProcessingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private SoundPlayer player;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task PlayAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        await Task.Run(() => player.Play());
    }

    public void Start(string audioFile)
    {
        player = new SoundPlayer(audioFile);

        // Perform audio processing asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Playback completed */ });
    }
}
```

**36. Using INotifyCompletion with Audio Processing**

```csharp
using System.Media;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var audioProcessingAsyncOperation = new AudioProcessingAsyncOperation();
    audioProcessingAsyncOperation.Start("myAudio.mp3");

    await audioProcessingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the audio processing is complete and the audio file has been played
}
```

**37. Implementing INotifyCompletion for Video Processing**

```csharp
using System.Drawing;
using System.Runtime.CompilerServices;

public class VideoProcessingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private VideoProcessor processor;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<Bitmap> GetFrameAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => processor.GetFrame());
    }

    public void Start(string videoFile)
    {
        processor = new VideoProcessor(videoFile);

        // Perform video processing asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Process video frame */ });
    }
}
```

**38. Using INotifyCompletion with Video Processing**

```csharp
using System.Drawing;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var videoProcessingAsyncOperation = new VideoProcessingAsyncOperation();
    videoProcessingAsyncOperation.Start("myVideo.mp4");

    await videoProcessingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the video processing is complete and you can retrieve the video frame
    Bitmap frame = await videoProcessingAsyncOperation.GetFrameAsync();
}
```

**39. Implementing INotifyCompletion for Networking**

```csharp
using System.Net;
using System.Net.Sockets;
using System.Runtime.CompilerServices;

public class NetworkingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private Socket socket;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<Socket> ConnectAsync(IPAddress address, int port)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        await Task.Run(() => socket.Connect(address, port));
        return socket;
    }

    public void Start(IPAddress address, int port)
    {
        socket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);

        // Perform networking operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Connection established */ });
    }
}
```

**40. Using INotifyCompletion with Networking**

```csharp
using System.Net;
using System.Net.Sockets;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var networkingAsyncOperation = new NetworkingAsyncOperation();
    networkingAsyncOperation.Start(IPAddress.Parse("127.0.0.1"), 80);

    await networkingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the networking operation is complete and you can retrieve the socket
    Socket socket = await networkingAsyncOperation.ConnectAsync();
}
```

**41. Implementing INotifyCompletion for Cryptography**

```csharp
using System.Security.Cryptography;
using System.Runtime.CompilerServices;

public class CryptographyAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private byte[] data;
    private HashAlgorithm algorithm;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<byte[]> ComputeHashAsync()
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => algorithm.ComputeHash(data));
    }

    public void Start(byte[] data, HashAlgorithm algorithm)
    {
        this.data = data;
        this.algorithm = algorithm;

        // Perform cryptography operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Hash computed */ });
    }
}
```

**42. Using INotifyCompletion with Cryptography**

```csharp
using System.Security.Cryptography;
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var cryptographyAsyncOperation = new CryptographyAsyncOperation();
    cryptographyAsyncOperation.Start(Encoding.UTF8.GetBytes("my data"), new SHA256Managed());

    await cryptographyAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the cryptography operation is complete and you can retrieve the hash
    byte[] hash = await cryptographyAsyncOperation.ComputeHashAsync();
}
```

**43. Implementing INotifyCompletion for Machine Learning**

```csharp
using System.Runtime.CompilerServices;

public class MachineLearningAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private MachineLearningModel model;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<Prediction> PredictAsync(object input)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => model.Predict(input));
    }

    public void Start(MachineLearningModel model)
    {
        this.model = model;

        // Perform machine learning operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Prediction generated */ });
    }
}
```

**44. Using INotifyCompletion with Machine Learning**

```csharp
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var machineLearningAsyncOperation = new MachineLearningAsyncOperation();
    machineLearningAsyncOperation.Start(new MyMachineLearningModel());

    await machineLearningAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the machine learning operation is complete and you can retrieve the prediction
    Prediction prediction = await machineLearningAsyncOperation.PredictAsync(new MyInputData());
}
```

**45. Implementing INotifyCompletion for Natural Language Processing**

```csharp
using System.Runtime.CompilerServices;

public class NaturalLanguageProcessingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private NaturalLanguageProcessor processor;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<ParsedData> ParseAsync(string text)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => processor.Parse(text));
    }

    public void Start(NaturalLanguageProcessor processor)
    {
        this.processor = processor;

        // Perform natural language processing operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Data parsed */ });
    }
}
```

**46. Using INotifyCompletion with Natural Language Processing**

```csharp
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var naturalLanguageProcessingAsyncOperation = new NaturalLanguageProcessingAsyncOperation();
    naturalLanguageProcessingAsyncOperation.Start(new MyNaturalLanguageProcessor());

    await naturalLanguageProcessingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the natural language processing operation is complete and you can retrieve the parsed data
    ParsedData parsedData = await naturalLanguageProcessingAsyncOperation.ParseAsync("my text");
}
```

**47. Implementing INotifyCompletion for Artificial Intelligence**

```csharp
using System.Runtime.CompilerServices;

public class ArtificialIntelligenceAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private AIEngine engine;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<Decision> MakeDecisionAsync(object input)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => engine.MakeDecision(input));
    }

    public void Start(AIEngine engine)
    {
        this.engine = engine;

        // Perform artificial intelligence operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Decision made */ });
    }
}
```

**48. Using INotifyCompletion with Artificial Intelligence**

```csharp
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var artificialIntelligenceAsyncOperation = new ArtificialIntelligenceAsyncOperation();
    artificialIntelligenceAsyncOperation.Start(new MyAIEngine());

    await artificialIntelligenceAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the artificial intelligence operation is complete and you can retrieve the decision
    Decision decision = await artificialIntelligenceAsyncOperation.MakeDecisionAsync(new MyInputData());
}
```

**49. Implementing INotifyCompletion for Cloud Computing**

```csharp
using System.Runtime.CompilerServices;

public class CloudComputingAsyncOperation : INotifyCompletion
{
    public bool IsCompleted { get; private set; }

    private CloudServiceProvider provider;

    public void OnCompleted(Action continuation)
    {
        continuation();
    }

    public async Task<object> ExecuteAsync(string functionName, object[] args)
    {
        if (!IsCompleted)
            throw new InvalidOperationException("Operation not yet completed.");

        return await Task.Run(() => provider.Execute(functionName, args));
    }

    public void Start(CloudServiceProvider provider)
    {
        this.provider = provider;

        // Perform cloud computing operation asynchronously
        IsCompleted = true;
        OnCompleted(() => { /* Function executed */ });
    }
}
```

**50. Using INotifyCompletion with Cloud Computing**

```csharp
using System.Runtime.CompilerServices;

public async Task MyAsyncMethod()
{
    var cloudComputingAsyncOperation = new CloudComputingAsyncOperation();
    cloudComputingAsyncOperation.Start(new MyCloudServiceProvider());

    await cloudComputingAsyncOperation; // Suspends until IsCompleted becomes true

    // Now the cloud computing operation is complete and you can retrieve the result
    object result = await cloudComputingAsyncOperation.ExecuteAsync("myFunction", new object[] { /* arguments */ });
}
```