Untitled

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Data.Entity;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp4
{
    public partial class Form1 : Form
    {
        EmpSystemManagerEntities db;

        public Form1()
        {
            InitializeComponent();
        }


        private void Form1_Load(object sender, EventArgs e)
        {
            db = new EmpSystemManagerEntities();
            db.Employees.Load();
            employeesBindingSource.DataSource = db.Employees.Local;
        }

        private void button1_Click(object sender, EventArgs e)
        {
            if (nom_et_PrénomTextBox.Text != String.Empty)
            {
                employeesBindingSource.AddNew();
                db.SaveChanges();

            }
            else
            {
                MessageBox.Show("please make sure to enter the user name", "Message", MessageBoxButtons.OK, MessageBoxIcon.Error);
            }
        }
    }
}