DBImballoContext.cs

using System.Data.Entity;
using System.Data.Entity.Infrastructure;
using SGVImballo.Data.Models.Mapping;

namespace SGVImballo.Data.Models
{
    public partial class DBImballoContext : DbContext
    {
        static DBImballoContext()
        {
            Database.SetInitializer<DBImballoContext>(null);
        }

        public DBImballoContext()
            : base("Name=DBImballoContext")
        {
        }

        public DbSet<Datalog> Datalogs { get; set; }

        protected override void OnModelCreating(DbModelBuilder modelBuilder)
        {
            modelBuilder.Configurations.Add(new DatalogMap());
        }
    }
}

Datalog.cs

using System;
using System.Collections.Generic;

namespace SGVImballo.Data.Models
{
    public partial class Datalog
    {
        public int ID_Datalog { get; set; }
        public System.DateTime data_inizio { get; set; }
        public string codice_operatore { get; set; }
        public string codice_impianto { get; set; }
        public string dataMatrix { get; set; }
        public string udc { get; set; }
        public string note { get; set; }
    }
}

DatalogMap.cs

using System.ComponentModel.DataAnnotations.Schema;
using System.Data.Entity.ModelConfiguration;

namespace SGVImballo.Data.Models.Mapping
{
    public class DatalogMap : EntityTypeConfiguration<Datalog>
    {
        public DatalogMap()
        {
            // Primary Key
            this.HasKey(t => t.ID_Datalog);

            // Properties
            this.Property(t => t.codice_operatore)
                .IsRequired()
                .HasMaxLength(20);

            this.Property(t => t.codice_impianto)
                .IsRequired()
                .HasMaxLength(20);

            this.Property(t => t.dataMatrix)
                .IsRequired()
                .HasMaxLength(25);

            this.Property(t => t.udc)
                .HasMaxLength(20);

            this.Property(t => t.note)
                .HasMaxLength(50);

            // Table & Column Mappings
            this.ToTable("Datalog");
            this.Property(t => t.ID_Datalog).HasColumnName("ID_Datalog");
            this.Property(t => t.data_inizio).HasColumnName("data_inizio");
            this.Property(t => t.codice_operatore).HasColumnName("codice_operatore");
            this.Property(t => t.codice_impianto).HasColumnName("codice_impianto");
            this.Property(t => t.dataMatrix).HasColumnName("dataMatrix");
            this.Property(t => t.udc).HasColumnName("udc");
            this.Property(t => t.note).HasColumnName("note");
        }
    }
}

Form1.cs

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

namespace SGVImballo.UI
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private DBImballoContext _context;

        private void button1_Click(object sender, EventArgs e)
        {

        }
    }
}