NSObject in C#

NSObject.cs

public class NSObject
{
    private IntPtr _handle;

    public NSObject()
    {
        IntPtr classHandle = Class.GetHandle("NSObject");
        var alloc = new Selector("alloc");
        var init = new Selector("init");
        _handle = Messaging.IntPtr_objc_msgSend(classHandle, alloc.Handle);
        _handle = Messaging.IntPtr_objc_msgSend(_handle, init.Handle);
    }

    ~NSObject() 
    {
        Dispose();
    }

    public void MakeItRain(string currency)
    {
         var selector = new Selector("makeItRain:");
         var currencyString = new NSString(currency);
         Messaging.void_objc_msgSend_IntPtr(_handle, selector.Handle, currencyString.Handle);
         currencyString.Dispose();
    }

    public void Dispose()
    {
         GC.SuppressFinalize(this);
         var release = new Selector("release");
         Messaging.void_objc_msgSend(_handle, release.Handle);
    }
}