找不到类型或命名空间名称

Question

我正在构建一个非常简单的页面。这在运行VS时非常有效，但是当它被发布到服务器时，它会给出“找不到类型或命名空间名称'EmployeeDBContext'（你是否缺少using指令或程序集引用？）”error

这是我的代码:(两个文件都上传到同一个文件夹）

***** WebForm1.asxp ******

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
namespace WebApplication4
{
    public partial class WebForm1 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

        EmployeeDBContext db = new EmployeeDBContext();
        Department Dept = new Department();
        Dept = db.Departments.SingleOrDefault(p => p.Id == 1);
        Response.Write(Dept.Id);
        Response.Write("<br>");
        Response.Write(Dept.Name);
        Response.Write("<br>");
        Response.Write(Dept.Location);

    }
}
}

**************** EmployeeDBContext班级************

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Data.Entity;

namespace WebApplication4
{
    public class EmployeeDBContext : DbContext
    {
        public DbSet<Department> Departments {get; set;}
        public DbSet<Employee> Employees { get; set; }
    }
}

********部门班.cs ********

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace WebApplication4
{
    public class Department
    {
    // Scalar Properties
    public int Id { get; set; }
    public string Name { get; set; }
    public string Location { get; set; }

    // Navigation Property
    public List<Employee> Employees { get; set; }
    }
}