data for 2010 formview control

Question

I am suppose to enhance an existing C# web form 2010 application. On the current web form page that I am suppose to enhance, the users enter some informatiion on the web page that updates one table in a sql server 2008 database.

  Now the table has been expanded to contain an additional 20 more columns. When the user clicks the existing 'submit' button, I am going to add a formview control that will be displayed on the lower part of the web page. The user will enter more information on the formview control and the one sql server table will be updated.
  I only want one update to the database table.

  Thus my questions are:
1. From the exisitng asp.net table, how can I make the formview control be displayed?
2. How would I pass data fromn the asp.net web table to the formview control? Would I make the properties public for this one object?

Can you tell me how you would accomplish this goal?