Adding New Records.

I'm to the Add New Records page now...And I am having a bit of a problem. My records look likes follows:
ID (unique identifier)
mMonth (event month)
mDay (event day)
mYear (event year)
mEvent (event description)
It is quite simple for me to take the text from the user's input in text boxes and assign it to each of these values, but I haven't created and don't want to create an ID textbox. Rather, I want the ID to auto-incremement. Does anyone know how to do that in ASP.NET?
So, what I need is for the script to realize that the database already has 567 records and thus to automatically label the ID as 568.
Respectfully,
David.

Thanks Mart. :-) Hmmm...thats a good question. I think because I never learned about it. I'm afraid I'm still starting off with all this. I read about it a while back, but this is my first real application since I wrote it in ASP. Other than that, once Web Matrix makes a database and you enter info. into it, it can't work with the structure anymore...just the contents.
Respectfully,
David.