public MockExpenseDataContext()
 {
     _expenses = new MockExpenseTable<Expense>(new List<Expense>());
     _expenseDetails = new MockExpenseTable<ExpenseDetail>(new List<ExpenseDetail>());
 }
 public MockExpenseDataContext()
 {
     _expenses       = new MockExpenseTable <Expense>(new List <Expense>());
     _expenseDetails = new MockExpenseTable <ExpenseDetail>(new List <ExpenseDetail>());
 }