ado.net to create login form

Question

i will upload  my project on next comment..

for tht i need to add login form with data acces layer

on my login form i have username,password and role

role have 2 values 1 . hr executive 2. other

executive have full privillage to my page 

but in others will disable or invisible all butttons can any body can hel p me..plzzz