Problem when inserting data into SQL Compact by ADO.Net Entity Framework

问题

        DatabaseEntities de = new DatabaseEntities();
        Income income = de.Incomes.CreateObject();            
        income.Id = de.Incomes.Max(f => f.Id) + 1;            
        income.Person = Users.SelectedValue.ToString();
        income.Value = value;
        income.Unit = Unit.SelectedValue.ToString();
        income.Description = Desc.Text;
        de.Incomes.AddObject(income);
        de.SaveChanges();           

I have used the code section above to insert an Income object into SQL Compact database after that i have used the following statement to bind data to a DataGridView:

        IncomeGridView.DataSource = de.Incomes;

I saw the new data but after I closed my program I did not see the new data in table. Can anyone explain me?

回答1:

Possibly this - http://erikej.blogspot.com/2010/05/faq-why-does-my-changes-not-get-saved.html

来源：https://stackoverflow.com/questions/3766596/problem-when-inserting-data-into-sql-compact-by-ado-net-entity-framework