when i add new column in my sql server 2014 Table..Visual c#

Question

I have a problem with my C# project in Visual Studio 2017. When I'm adding a new column to my SQL server 2014 table I can't find it in VS 2017 data grid and other you can check my 3 picture:

 

 

 

My code in Student.cs class

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace CURD
{
public class Student
{
public int StudentID { get; set; }
public string FullName { get; set; }
public string mcbRozetavalod { get; set; }
public string mcbMahetavalod { get; set; }
public string mcbTarikheTavalod { get; set; }
public string Email { get; set; }
public string Address { get; set; }
public string ImageUrl { get; set; }
public bool Gender { get; set;
}
}
}

And my code in EntityState.cs class

using System;
using System.Collections.Generic;
using System.Linq; using System.Text;
using System.Threading.Tasks;
namespace CURD
{
public enum EntityState
{
Unchanged,
Added,
Changed,
Deleted
}
}