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DataSourceDBEntities db1 = new DataSourceDBEntities();
var q1 =
from f in db1.Foods
select f;
Food food = q1.FirstOrDefault<Food>();
DataSourceDBEntities db2 = new DataSourceDBEntities();
// food = new Food();
// food.Id = 1;
food.AddDate = DateTime.Now;
if (food.NAME == "Orange")
food.NAME = "Apple";
else
food.NAME = "Orange";
db2.Foods.Attach(food);
db2.SaveChanges();