FrmOgrenciNotlar.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 System.Data.SqlClient;

namespace BonusProje1
{
    public partial class FrmOgrenciNotlar : Form
    {
        public FrmOgrenciNotlar()
        {
            InitializeComponent();
        }

        SqlConnection baglanti = new SqlConnection(@"Data Source=DESKTOP-1C38CAO\SQLEXPRESS01;Initial Catalog=BonusOkul;Integrated Security=True");

        public string numara; 
        private void FrmOgrenciNotlar_Load(object sender, EventArgs e)
        {
            SqlCommand komut = new SqlCommand("SELECT DERSAD,SINAV1,SINAV2,SINAV3,PROJE,ORTALAMA,DURUM FROM TBLNOTLAR INNER JOIN TBLDERSLER ON TBLNOTLAR.DERSID=TBLDERSLER.DERSID Where OGRID=@P1",baglanti);
            komut.Parameters.AddWithValue("@P1",numara);
            //this.Text = numara.ToString();
            SqlDataAdapter da = new SqlDataAdapter(komut);
            DataTable dt = new DataTable();
            da.Fill(dt);
            dataGridView1.DataSource = dt;

        }
    }
}