title: set data link file instead of connection string
body: <p>delphi 7,</p>
  
  <p>when opening a connection to db, you can choose data link file, or Connection String.</p>
  
  <p>when the program compiles , it connects with connection string. on run time, there is a need to change to an user input udl.</p>
  
  <p>what is the property to change in order to change the conneciton?</p>