Advanced login system ASP.net c#

 hi im newbie for ASP.net C#

 I did 5 aspx pages named
      1.login
       2.verifypage
        3.register
        4.usermainpage
         5.admin

i finished 4pages designs,and SQLDB connections.

 now i have one problem read cont...
 when user login  the page validate the username.password by using SQL account database
   i checked it.. if username,password is matched means redirected to page two(verifypage.aspx)

 problem 1: here user he/she have to enter security ans(securityques already get whe user register)
here if he entered wrong/incorrect ans means that user  need to block .
                how to do it. i tried to solve but i cant. plz help how to block that user name not allow to login.

problem 2: that blocked user name appeared in admin page list view. plz anyone help.



how to solve. give detail code solution. thanks . i already posted some forums but i got only failure. i hope this website help me.... have a nice day