How do you implement IDisposable?

Question

Accepted Answer

**IDisposable** — cleanup unmanaged resources.

**Basic implementation:**
```csharp
public class MyResource : IDisposable
{
    private bool _disposed = false;
    private IntPtr _handle;

public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }

protected virtual void Dispose(bool disposing)
    {
        if (!_disposed)
        {
            if (disposing) { /* Free managed */ }
            CloseHandle(_handle);  // Free unmanaged
            _disposed = true;
        }
    }

~MyResource() { Dispose(false); }
}
```

**Using statement:**
```csharp
using var resource = new MyResource();
// resource.Dispose() called automatically
```

**Key:** Implement Dispose for cleanup.

C#: How do you implement IDisposable?