Find out when you are blocked by Craigslist

When [login to view URL] sees lot of connections comming from one ip address then they block that connection for some time. This is what I want: Connections information detailing how to know when you are blocked and when you are risking blockage.? Do they block based on number of connections to them? do they block by number of bytes that they served you or something else? You will also, write a c# VS2005 program which will show me a message just before the blockage so that I can stop connections.? How would I know they have already blocked me?? c# program should detect that too.? If they block based on number of connections then what is that number?? If they block based on number of bytes then what is the byte count? Each and every detail about their blockage.