hi im edison and i need help regarding visual basic 6

im making a project where the class would take an exam..

before they take the exam, i want them to enter their username and password (which i already made in Visdata).so if they enter a username then password, the program would look it up in the database and if their name and password were there, they could take the test. i already put the data control with databasename and recordsourcetype, and then i set the datafield and datasource for the textboxes. i just dont know how to write a simple code that would read the data in the database to check whether they are in that list and if their username and password is correct.

Also, im planning to make the questions in random so that they would answer different questions. at the end, the program would evaluate their scores and see how they did in the exam. how do u do all that?

im hoping that you would answer me as soon as possible.. i need it badly. thanks for helping me.