using System;

using System.Runtime.InteropServices;

​

///////////////////////////////

// Fix issues in this class. //

///////////////////////////////

class MyClass : IDisposable {

    private IntPtr _buffer;       // unmanaged resource

    private SafeHandle _resource; // managed resource

    private bool _disposed = false;

    public MyClass() {

        this._buffer = Helper.AllocateBuffer();

        this._resource = Helper.GetResource();

    }

    ~MyClass() {

        Dispose(true);

    }

    public virtual void Dispose() {

        Dispose(true);

    }

    private void Dispose(bool disposing) {

        Helper.DeallocateBuffer(this._buffer);

        if (disposing) {

            if (this._resource != null) this._resource.Dispose();

        }

        this._disposed = true;

    }

    public void DoSomething() {

        // Manupulation with _buffer and _resource.

    }

}

​

​

/////////////////////////////////////

// Usage, do not change this code. //

/////////////////////////////////////

public class Program {

    public static void Main() {

        using (var myClass = new MyClass()) {

            myClass.DoSomething();

            myClass.Dispose();

            myClass.DoSomething();

        }

    }

}

​

​

/////////////////////

// Skip this code. //

/////////////////////

static class Helper {

    public static IntPtr AllocateBuffer() { return IntPtr.Zero; }

    public static void DeallocateBuffer(IntPtr ptr) {}

    public static SafeHandle GetResource() { return new Microsoft.Win32.SafeHandles.SafeFileHandle(IntPtr.Zero, true); }

}