count the number of visitors?

Hi, I'm doing project in asp.net I want to do count the number of visitors: online, today, yesterday, this week, last week, this month, last month and total. I want to use the procedure (or write one class to handle the better), you can help me? Ah, online, total I have seen many people with global processing, but I see it's not really accurate. People can help me handle it by calculating "the IP address"?   P/S: I want code can be count number of visitors online ,today, yesterday, this week, last week, this month, last month and total. The reason I want do it for "IP address" because when using global to save file access number is still increasing even if only one person online(use two or more different browsers at the same time). -> Thus it is clear that the number of visitors at it's fake, inaccurate. ...