//引入命名空间
using (Northwnd db2 = new Northwnd(@"c:\northwnd.mdf"))
      {
          Customer Cust_File = new Customer();
          string xmlFile = "";
          
          // Get the original object from the deserializer.
          Customer c = SerializeHelper.Deserialize<Customer>
              (xmlFile, Cust_File);

          // Set all the desired properties to the entity to be attached.
          Customer c_updated = new Customer() { CustomerID = c.CustomerID,
              Phone = "425-123-4567", CompanyName = "Microsoft" };
          db2.Customers.Attach(c_updated, c);

          // Perform last minute updates, which will still take effect. 
          c_updated.Phone = "425-765-4321";

          // SubmitChanges()sets the phoneNumber and CompanyName of
          // customer with customerID=Cust. to "425-765-4321" and
          // "Microsoft" respectively.
          db2.SubmitChanges();  
      }