Блочная отправка методом GET

        private void button3_Click(object sender, RoutedEventArgs e)
        {
            string sql;
            sql = "";
            List listPk = new List();
            PiketListItem npkt;
            foreach (PiketListItem pkt in dataGrid1.ItemsSource as List)
            {
                npkt = new PiketListItem();
                npkt.ID = pkt.ID;
                if (pkt.FROM != null)
                    npkt.FROM = pkt.FROM.Trim();
                if (pkt.TO != null)
                    npkt.TO = pkt.TO.Trim();
                if (pkt.BEARING != null)
                    npkt.BEARING = pkt.BEARING.Trim();
                if (pkt.INC != null)
                    npkt.INC = pkt.INC.Trim();
                if (pkt.LENGTH != null)
                    npkt.LENGTH = pkt.LENGTH.Trim();
                if (pkt.LEFT != null)
                    npkt.LEFT = pkt.LEFT.Trim();
                if (pkt.UP != null)
                    npkt.UP = pkt.UP.Trim();
                if (pkt.DOWN != null)
                    npkt.DOWN = pkt.DOWN.Trim();
                if (pkt.RIGHT != null)
                    npkt.RIGHT = pkt.RIGHT.Trim();
                if (pkt.COMMENTS != null)
                    npkt.COMMENTS = pkt.COMMENTS.Trim();
                npkt.IsPiket = pkt.IsPiket;
                npkt.IsPiketWall = pkt.IsPiketWall;
                listPk.Add(npkt);
            }
            blocks = new List();
            BlockGet bl = new BlockGet();
            string s;
            foreach (PiketListItem pkt in listPk)
            {
                string sIsPiket = "0";
                if (pkt.IsPiket) sIsPiket = "1";
                string sIsPiketWall = "0";
                if (pkt.IsPiketWall) sIsPiketWall = "1";

                s = "insert into wp_pkt_bf(p_FROM,p_TO,p_AZIMUT,p_INC,p_LENGTH,p_LEFT,p_UP,p_DOWN,p_RIGHT,p_COMMENTS,p_IsPiket,p_IsPiketWall,sessionid) values "
                    + "(\"" + pkt.FROM + "\",\"" + pkt.TO + "\",\"" + pkt.BEARING + "\",\"" + pkt.INC + "\",\"" + pkt.LENGTH +"\","
                    + "\"" + pkt.LEFT + "\",\"" + pkt.UP + "\",\"" + pkt.DOWN + "\",\"" + pkt.RIGHT + "\",\"" + pkt.COMMENTS + "\","
                    + "\"" + sIsPiket + "\",\"" + sIsPiketWall + "\",\""+sessionID+"\"" 
                    + ");" + "\r\n";
                if (bl.blockText.Length + s.Length < 1000)
                {
                    bl.blockText += s;
                }
                else
                {
                    sql+=bl.blockText;
                    bl.blockId=DateTime.Now.Hour.ToString()+DateTime.Now.Minute.ToString()
                        +DateTime.Now.Second.ToString()+DateTime.Now.Millisecond.ToString();
                    blocks.Add(bl);
                    bl=new BlockGet();
                    bl.blockText = s;
                }
            }
            //textBoxLog.Text += "SQL:" + "\r\n" + sql + "\r\n";
            // http://aks.m-ten.ru/webpiket/datagetway.php


            #region Отправить методом GET
            //метод не совсем подходящий, но рабочий POST пока не нашел как заставить работать
            //Установил ограничение длины строки get = 1000 символа + ~100(http://aks.m-ten.ru/webpiket/datagetway.php?act=insertpkt&blockid=114440901&sessionid=0&sql=)
            Uri uri;
            WebClient wc;
            foreach (BlockGet blk in blocks)
            {
                uri = new Uri(getwayURL.Text + "?act=insertpkt&blockid=" + blk.blockId + "&sessionid=" + sessionID + "&sql=" + blk.blockText, UriKind.Absolute);
                textBoxLog.Text += "uri.OriginalString = " + uri.OriginalString + "\r\n";

                wc = new WebClient();
                textBoxLog.Text += "DownloadStringCompleted... blockid=" + blk.blockId + "\r\n";
                wc.DownloadStringCompleted += new DownloadStringCompletedEventHandler(DownloadStringCompletedHndlr);
                textBoxLog.Text += "DownloadStringAsync... \r\n";
                wc.DownloadStringAsync(uri, "POST");
            }

            #endregion Отправить методом GET

        }