updating sqlexpress database from drop down menus

Question

I have a groupbox and inside I have a few dropdown menus. I have 2 radio buttons (one is to add an entry to the gridview and the other is to update an existing entry to the gridview). I have a save button that commits the changes to the sqlexpress database. 

I am not sure base on what i have selected from the drop down menus how to commit the changes to the database.  NOTE: I am new doing this.

Any ideas or code that has been done?