Rollback with Membership

Hi, guys. I don´t have an idea how to solve this:

I have an asp.net application with sql server database including the aspnet database that correspond to the asp.net membership.

I have a web page where I create users, roles, users in roles and so on with only one click and I´m using SqlTransaction to do this, so if any query does not work, then I do a rollback to all the queries, something like this:

try {

SqlConnection fconConexion = new SqlConnection();
this.fconConexion.Open();
< ...