如何在asp.net mvc中获取最后插入的邮件？

Question

我在db

中有错误

  

访问db

中的非静态成员需要

对象引用

我的方法

public static object GetOrderEmail(List<Lunch> lunch1)
{         
   StringBuilder email = new StringBuilder();

   string text = "";

   foreach (var lunch in lunch1)
   {              
      Lunch lun = db.Lunch.OrderByDescending(p => p.Email).FirstOrDefault().Email;
      email.AppendFormat(lunch.Email);

      text = lunch.Email;
   }

   return text;
 }