增

using (StudentEntities ent = new StudentEntities())                    {                        User aNewUser = new User()                        {                            Age = 20,                            Name = strName,                            Sex = strSex                        };                        ent.User.Add(aNewUser);                        if (ent.SaveChanges() > 0)                        {                            Response.Write("添加成功。");                        }                        else                        {                            Response.Write("添加失败。");                        }                        Response.End();                    }

删

using (StudentEntities ent = new StudentEntities())                    {                        User aUser = (from c in ent.User where c.ID == iID select c).FirstOrDefault();                        if (aUser != null)                        {                            ent.User.Remove(aUser);                            if (ent.SaveChanges() > 0)                            {                                Response.Write("删除成功。");                            }                            else                            {                                Response.Write("删除失败。");                            }                        }                        else                        {                            Response.Write("不存在此用户，请确认用户ID是否正确。");                        }                        Response.End();                    }

改查

using (StudentEntities ent = new StudentEntities())            {                User aUser = (from c in ent.User where c.ID == iID select c).FirstOrDefault();                if (aUser != null)                {                    aUser.Name = strName;                    aUser.Age = 20;                    aUser.Sex = strSex;                    if (ent.SaveChanges() > 0)                    {                        Response.Write("");                    }                }            }