Form Redirect

Any help will be appreciated; please am new to ASP and am trying to code a redirect. that is when someone put in his or her acountNumber and password and it is the same as the one in the database, it will show the acount details. my problem now is how to match the acount number with the pin that is in the database and show the acount details. i ve got the dropdownbox showing the acountnumbers but how to get the pin working with the textbox is the problem.