asp.net mvc 3 - Using mvc3, I need to add a username/password to the sql connection string at runtime -

i see how build string using stringbuilders (sql/entity framework); do cause connection string used in dbcontext?

example context:

public class pophistorydbcontext : dbcontext {     public dbset<pophistory> histories {get;set}  }  public class pophistoryrepository: ihistoryrepository {     private pophistorydbcontext context = new pophistorydbcontext();      public iqueryable<pophistory> histories{         {return context.histories;}     } } 

example usage in controller:

public class historycontroller : controller {     private ihistoryrepository repository = new pophistoryrepository();     var histories = h in repository.histories (h.modifytimestamp > today) select h;     if (!string.isnullorempty(searchstring))         {             histories = histories.where(h => h.dn.toupper().contains(searchstring.toupper()));         } 

thank you