title: Connect to different databases using LINQ
body: <p>I need write simple util, which will connect to different databases. It'll be good to use LINQ. How can I create custom connection using LINQ? 
  For example, there'll be form with 4 textboxes: server, database name, login and password. And I need create connection string with this params. </p>
  
  <p>I know how can I do it via ADO, but I need use LINQ.</p>
  
  <p>P.S. LINQ to SQL. </p>