In Logincontrol tool control how to write the code to login only those persons whose username and password are stored in database?

Ok it depends on the program but I give you an idea Say that you have a Table in a data base Table(user,password,mail,date,cathegory) In your program create two variables var UserId and PassWord as strings With your program invoke this sql statement SQL = "Select * From Table Where user = " + UserId + "password = " + PassWord execute it if it returns not nul rows numbers then the user is accepted else the user is rejected