activation mail , new user , CreateUserWizard

hi!

 i use the default createUser Wizard. when user clicks on register i use this code behind:
protected void CreateUserWizard1_CreatedUser1(object sender, EventArgs e)
{
MembershipUserCollection users = Membership.FindUsersByName(CreateUserWizard1.UserName);foreach (MembershipUser user in users)
{

// my activation ...