Entity Framework DBContext Databinding Issues

Question

Using VS2010, C#, Winforms and Entity Framework 4.1

Here is my code

var order = dbContext.Orders.Where(o=>o.OrderId == 1).Single();
var orderDetails = order.OrderDetails.ToList():

textBox1.Bindings.Add("Text", order, "OrderAmount");
gridView.DataSource = orderDetails;

I have following two questions about Entity Framework 4.1

1. If I update an entity property, the new value is not reflected to the UI.

2. I want to add logic to an entity property setter; but it gets rewritten each time the model is updated.

Thanks.

Answer 1

About the second question.
Automatic updating of classes is how the model first works.
You can read EF 4.1 Code-first vs Model/Database-first for more information.

Sometimes it's convenient to modify the T4 template. But I don't recommend to change getters/setters. Instead adding some dataannotations attributes could be useful. You can read how to use it on MSDN:
Using Data Annotations to Customize Data Classes
How to: Validate Model Data Using DataAnnotations Attributes

Answer 2

use the on property change inside of the databinding

textBox1.DataBindings.Add("Text",order,"OrderAmount",true,System.Windows.Forms.DataSourceUpdateMode.OnPropertyChanged);