How to connect this

I have a user control with data of person. iN this user control is subroutine which storing data to database of person.On my ASPX page I've implemented this control and another form with data which ii'm storing.On button click on ASPX page, i want to store all my data including data from my user control or subroutine in that user control which storing data of person.I want to make sqltransaction, so only one connection for aspx page and user control.ASPX.vb
            Button click
                car as string
                color as string
                connection, command
               execute nonquery


             ...