login credentials for encrypt and decrypt

Question

hi friends
iam developing one application userlogin details save in logintable.
i  have a table like columns and having data.
 Loginid    UserName         Password
   1              admin               admin123
   2              employee         employee123

now i want to save this password into encrypted form in table. like 9169db2df5873491ceeddd7cf49ed328a880e4c7

in my login.aspx page i was entered username admin
                                                           password admin123


when iam click login button this admin123 password will be converted to encrypted form  now i want to compare this encrypted password  with database encrypted password


please help me 
iam new to this topic.
thanking you friends.