Shopping cart in using sessions

public void BulkCopy()
    {
        dt = (DataTable)Session["lstCars"];
        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand cmd = new SqlCommand("TRUNCATE TABLE carsForSale", connection);//this procedure to delete the whole data in  database table 
            connection.Open();
            cmd.ExecuteNonQuery();//first you have to clear the data
            SqlBulkCopy bulkObj = new SqlBulkCopy(connection);//bulkCopy can insert into you dable in database all the values in the DataTable @ the same time
            bulkObj.DestinationTableName = "carsForSale";//table name 
            bulkObj.WriteToServer(dtUsers);//data you want to insert
            connection.Close();
        }
    }