How to join multiple tables?

Question

I have the following classes. I have a object var of Description class. I want to select Balance related to the Client provided in the var object u

Answer 1

You could try this:

var balance = (from a in context.Accounts
               join c in context.Clients on a.UserID equals c.UserID
               where c.ClientID == yourDescriptionObject.ClientID
               select a.Balance)
              .SingleOrDefault();

Or - if you only have the DescriptionID:

var balance = (from a in context.Accounts
               join c in context.Clients on a.UserID equals c.UserID
               join d in context.Descriptions on c.ClientID equals d.ClientID
               where d.DescriptionID == yourDescriptionID
               select a.Balance)
              .SingleOrDefault();

(Or FirstOrDefault() or ToList() or Sum()? Because your model would allow that clients/descriptions are related to multiple accounts ...)