using System.Data.Entity;

using WindowsFormsApp10.Entities;

public class MyDbContext : DbContext

{

    public MyDbContext() : base("name=MyDbConnection") // config dosyasındaki isim

    {

        Database.SetInitializer<MyDbContext>(null); // ❗ Veritabanı oluşturma girişimini engeller

    }

    public DbSet<ogrenci> ogrenci { get; set; }

}

using System.ComponentModel.DataAnnotations.Schema;

namespace WindowsFormsApp10.Entities

{

    [Table("ogrenci")]

    public class ogrenci

    {

        public int Id { get; set; }

        public string ad { get; set; }

        public int yas { get; set; }

    }

}

<?xml version="1.0" encoding="utf-8"?>

<configuration>

<configSections>

<section name="entityFramework"

type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089"

requirePermission="false" />

</configSections>

<startup>

<supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.6.2" />

</startup>

<connectionStrings>

<add name="MyDbConnection"

connectionString="Data Source=(LocalDB)\MSSQLLocalDB;

                         AttachDbFilename=C:\VeritabaniDosyam\Database1.mdf;

                         Integrated Security=True;

                         Connect Timeout=30;

                         MultipleActiveResultSets=True"

providerName="System.Data.SqlClient" />

</connectionStrings>

<entityFramework>

<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">

<parameters>

<parameter value="mssqllocaldb" />

</parameters>

</defaultConnectionFactory>

<providers>

<provider invariantName="System.Data.SqlClient"

 type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />

</providers>

</entityFramework>

</configuration>

using System;

using System.Linq;

using System.Windows.Forms;

using WindowsFormsApp10.Entities;

namespace WindowsFormsApp10

{

    public partial class Form1 : Form

    {

        public Form1()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            using (var db = new MyDbContext())

            {

                db.ogrenci.Add(new ogrenci { ad = "ramazan",yas=12 });

                db.SaveChanges();

                var liste = db.ogrenci.ToList();

                gridControl1.DataSource = liste;

            }

        }

        private void button2_Click(object sender, EventArgs e)

        {

            using (var db = new MyDbContext())

            {

                var liste = db.ogrenci.ToList();

                gridControl1.DataSource = liste;

            }

        }

    }

}