问如何连接SQL SERVER并将数据插入数据库？

EN

DateTime Start = DateTime.Now;
        List<Point> points = new List<Point>();
        System.Data.SqlClient.SqlConnection myConnection = new SqlConnection("server=localhost;" +
                                   "Trusted_Connection=yes;" +
                                   "database=UrbanPlan; " +
                                   "connection timeout=30");
        try
        {
            myConnection.Open();
            //here is giving successfull message
            Console.WriteLine("Successful");
        }
        catch (SqlException ex)
        {
            Console.WriteLine("You failed!" + ex.Message);
        }

        string csv_file_path = @"C:\Users\Joe\Desktop\geocoding.csv";
        DataTable csvData = GetDataTabletFromCSVFile(csv_file_path);

        int num = 0;
        while (num < 10)
        {
            double longitude = Convert.ToDouble(csvData.Rows[num][1]);
            double latitude = Convert.ToDouble(csvData.Rows[num][2]);

            int numForCheck = 0;
            while (longitude != Convert.ToDouble(csvData.Rows[numForCheck][1]) && latitude != Convert.ToDouble(csvData.Rows[numForCheck][2]))
            {
                numForCheck++;
            }

            if (numForCheck == num)
            {
                points.Add(new Point(longitude, latitude));
            }
            num++;
        }

        double eps = 1.0;
        int minPts = 2;
        List<List<Point>> clusters = GetClusters(points, eps, minPts);
        //Console.Clear();
        // print points to console
        Console.WriteLine("The {0} points are :\n", points.Count);
        foreach (Point p in points) Console.Write(" {0} ", p);
        Console.WriteLine();
        // print clusters to console
        int total = 0;
        for (int i = 0; i < clusters.Count; i++)
        {
            int count = clusters[i].Count;
            total += count;
            string plural = (count != 1) ? "s" : "";
            Console.WriteLine("\nCluster {0} consists of the following {1} point{2} :\n", i + 1, count, plural);
            foreach (Point p in clusters[i])
            {
                string sql = "INSERT INTO AntennaLocationByRegions (RegionId, Longitude, Latitude) values (@RegionId, @Longitude, @Latitude)";
                SqlCommand cmd = new SqlCommand(sql, myConnection);
                cmd.Parameters.Add("@RegionId", SqlDbType.Int);
                cmd.Parameters["@RegionId"].Value = i + 1;
                cmd.Parameters.Add("@Longitude", SqlDbType.Float);
                cmd.Parameters["@Longitude"].Value = p.Long;
                cmd.Parameters.Add("@Latitude", SqlDbType.Float);
                cmd.Parameters["@Latitude"].Value = p.Lat;
                cmd.ExecuteNonQuery();
            }
            Console.WriteLine();
        }