• Enable assemblies that create an instance of your class to free up any resources the instance has consumed.
• Only implement IDisposable when one of your members implements it, or when you use native resources.

• Implement a virtual Dispose(bool) in your base class which combines disposing native and managed resources.
  • Dispose() will call Dispose(true), while the finalizer will call Dispose(false).
• A Dispose method should call the GC.SuppressFinalize method for the object it is disposing.

public class DisposableClass : IDisposable
{
    private bool _disposed = false;
 
    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
 
    protected virtual void Dispose(bool disposing)
    {
        // Note that Dispose() is not thread-safe in this form!
        // If thread-safety is required, you need to implement this.
        if (!_disposed)
        {
            if (disposing)
            {
                // Dispose managed resources.
            }
 
            // Release unmanaged resources.
        }
 
        _disposed = true;
    }
 
    ~DisposableClass()
    {
        Dispose(false);
    }
 
    public void SomeMethod()
    {
        if (this._disposed) { throw new ObjectDisposedException(this.GetType().Name); }
    }
}
 
public class DisposableSubClass : DisposableClass
{
    private bool _disposed = false;
 
    protected override void Dispose(bool disposing)
    {
        if (!_disposed)
        {
            try
            {
                if (disposing)
                {
                    // Release the managed resources you added in
                    // this derived class here.
                }
                // Release the native unmanaged resources you added
                // in this derived class here.
 
                _disposed = true;
            }
            finally
            {
                // Call Dispose on your base class.
                base.Dispose(disposing);
            }
        }
    }
}

using (DisposableClass c = new DisposableClass())
{
    c.SomeMethod();
}