using (var edm = new NorthwindEntities())

 {

 Customers c = new Customers { CustomerID = "c#", City = "成都市", Address = "中国四川省", CompanyName = "cnblogs", Country = "中国", Fax = "", Phone = "", PostalCode = "", Region = "天府广场", ContactName = "风车车.Net" };

 edm.AddToCustomers(c);

 int result = edm.SaveChanges();}

using (var edm = new NorthwindEntities())

{

Customers deletec = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c2");

edm.DeleteObject(deletec);

int result = edm.SaveChanges();

}

 using (var edm = new NorthwindEntities())

 {

 Customers addc = edm.Customers.FirstOrDefault(cc => cc.CustomerID == "c2");

 addc.City = "CD";

 addc.ContactName = "cnblogs";

 addc.Country = "CN";

 int result = edm.SaveChanges();

 }

 private static List<Post> GetPostList(int pageIndex, int pageSize)

 {

     int startRow = (pageIndex - ) * pageSize;

     using (var db = new EdiBlogEntities())

     {

         var query = db.Post.OrderByDescending(p => p.PubDate).Skip(startRow).Take(pageSize);

         return query.ToList();

     }

 }