Hello MKamiishi !!!

I fix the problem second. Error which my windows. When i setup new Windows, this has been fix.

The problem first. I can't load data from DBContext.
I create the project style webform.
I make DataBase with Entity Framework version 6.1.3 type Code First.
I do step by step:

Link : https://www.asp.net/mvc/overview/getting-started/getting-started-with-ef-using-mvc/creating-an-entity-framework-data-model-for-an-asp-net-mvc-application..

But My project is Webform and exam MVC. When use get method load data to report. No data recive
Exam Code:

private SchoolContext db = new SchoolContext();
public IEnumerable<Students> GetStudents()
        {
            return View(db.Students.ToList());
        }

Note: Webdatagird is ok when i load this method. And i use SQL Data Source with Northwind , report is ok
I think problem with code

Please help me.

Thanks You !!!