Best three tier C# Implement "style"
<p>I'm new to C# three tier implement and I've found a lot of implementations in Internet. I don't know what difference and benefit from its .</p>

<p><img src="http://photo.1280.com/images/n8b/61YRE697/myteacher.jpeg" alt="alt text">
<img src="http://photo.1280.com/images/wnh/0JZCDRM5/another.jpeg" alt="alt text"></p>

<p>Thanks a lot for reading this and I'm waiting for your answers. And I really want to know your implementation :)</p>
