dealing with long webforms

hello I am wondering the best approach while im still in design mode we have this webform we are building that is broken up into about 8 different pages or sections.  Some pages are short only about 10 controls (radiobutton lists, textboxes) and some are long 100 controls.  We anticipate users may not finish the longer forms and would probably want to save and return later to finish.  it seems ideal to add two buttons "save" and a "save and continue" button, where the "save and continue" would advance them to the next section or page in the webform, users can skip and return to different sections of the webform.  So I made the front end with all the controls and plan on programmatically updating and or inserting everything from the code behind using sql configuration.  So here it is, do skip an insert command all together and just use update initially?  So the first records inserted would actually be by an ...