My search with radio button in C# doesn't work

I'm trying to filter a DataGridView with RadioButton when DateDePublication is Checked and the value of the search text equals for example 2000 table should return all books who have DateDePublication equals to 2000

this is Search Button code :

<pre lang="C#"> private void RechBtn_Click(object sender, EventArgs e)
        {
            dataGridView1.DataSource = repository.GetAllLivres(rechtext.Text);

        }

public List<Livre> FilterDateDePublication(string date)
    {
        using (var connection = factory.CreateConnection())
        {
            var livres = new List<Livre>();
            connection.ConnectionString = connectionString;
            connection.Open();
            var command = factory.CreateCommand();
            command.Connection = connection;
            command.CommandText = "select * from livre where date_publication like '%" + date + "%'";
            using (DbDataReader reader = command.ExecuteReader())
            {
                while (reader.Read())
                {
                    Livre l = new Livre();
                    l.Isbn = reader["isbn"].ToString();
                    l.Titre = reader["titre"].ToString();
                    l.DatePublication = DateTime.Parse(reader["date_publication"].ToString());
                    l.NombrePage = Int32.Parse(reader["nombre_page"].ToString());
                    l.Couverture = reader["couverture"].ToString();
                    l.Prix = Double.Parse(reader["nombre_page"].ToString());
                    l.QuantiteDisponible = Int32.Parse(reader["quantite_disponible"].ToString());
                }
            }
            return livres;

        }

DataRow[] foundRows = YourDataTable.Select(searchExpression);