填充DataGridView

string constr = @"Data Source=(localdb)MSSQLLocalDB;Initial Catalog=Test;Integrated Security=True;Connect Timeout=30;Encrypt=False;TrustServerCertificate=False;ApplicationIntent=ReadWrite;MultiSubnetFailover=False";
private void Form1_Load(object sender, EventArgs e)
{
    dataGridView1.Columns["Column4"].DefaultCellStyle.Format = "N2";
    using (SqlConnection conn = new SqlConnection(constr))
    {
        SqlDataAdapter sda = new SqlDataAdapter("Select * From Car", conn);
        DataSet Ds = new DataSet();
        sda.Fill(Ds, "T_Class");

        foreach (DataRow row in Ds.Tables[0].Rows)
        {
            int index = dataGridView1.Rows.Add();
            dataGridView1.Rows[index].Cells["Column1"].Value = row["Id"];
            dataGridView1.Rows[index].Cells["Column2"].Value = row["Model"];
            dataGridView1.Rows[index].Cells["Column3"].Value = row["Price"];
            dataGridView1.Rows[index].Cells["Column4"].Value = row["Code"];
        }
    }
}