Some controls not showing up in the AllKeys[] collection?

Hi Friends,
 I have  several forms I have to save in a DB. I created a class to do this and I just pass it the "Request" and the "Page" as parameters. To save all the fields I iterate through all the Form.AllKey collection and save the values for the controls I'm interested in.
 The problem is that the CheckBox and Calendar controls does not appear in that collection!!! I can't get their values in my class!!!
 
Any idea of how can I solve this? Can I use the viewstate here?
 
Thanks  a lot
 
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