EF 在生成ado.net entity Data Model 遇到的问题
申明，本人菜鸟，依葫芦画样出现的问题：
在使用ado.net entity Data Model 自动生成
Model.Designer.sc文件中有：
public partial class NorthwindEntities : ObjectContext
{这里有public ObjectSet<Employee> Employees{get...}
Model.Context.cs文件中有：
public partial class NorthwindEntities : DbContext
{public DbSet<Employee> Employees { get; set; }}
页面代码：
NorthwindEntities db = new NorthwindEntities();
gridView1.DataSource=db.Employees;
gridView.DataBind();
运行出错：
Data binding directly to a store query (DbSet, DbQuery, DbSqlQuery) is not supported. Instead populate a DbSet with data, for example by calling Load on the DbSet, and then bind to local data. For WPF bind to DbSet.Local. For WinForms bind to DbSet.Local.ToBindingList().
猜测：同时有ObjectSet<>和DbSet<>类型的Employees，db.Employees选择了DbSet<>，
删掉public partial class NorthwindEntities : DbContext
{public DbSet<Employee> Employees { get; set; }}
然后就正常！
问题：DbSet<>怎么用？本人菜鸟。谢谢各位大大指点
