&<asp:SqlDataSource&> Need A Look Over To See If I Am Writing This Correctly.

This is a subset question of one of my other threads, the gist is while using forms authentication, I am trying to enter additional information into another table on the same db as the aspnet_membership tables.  I think I need an <asp:SqlDataSource> to do this because it is about the only thing left I haven't tried to get this code to work so any help is appreciated.  Environment: sql server 2000, windows server 2003, asp.net 2.0, vb, no GUI
<ASP:SqlDataSource id="addedInfo" ConnectionString="<%$ ConnectionStrings:SqlServerConnection %>" InsertCommand="INSERT INTO addInfo(username,email,company,firstname,lastname,phone) VALUES (@username,@email,@company,@firstname,@lastname,@phone)" runat="server" />
looking over some of my books and online it says in the connectionStrings that it is supposed to be the database name that goes next to the : but when I try that I get an error that it is looking for the name of the connection string, so I enter the name of the connection string (as above) and nothing happens, which is basically the ongoing event with this whole problem, the form fields (username, email, password) that go into the aspnet_membership tables just fine, I don't have any problems with those, it is getting the additional information into another table that has been stalling me the whole time.
So does this sqldatasource look right?  Any help is appreciated.