asp.net ช่วยดูเรื่องตัวแปร array c# หน่อยครับ : Error : Use of unassigned local variable

 public static string getDataFromGeneratedCSV()
        {

                SqlConnection objConn = new SqlConnection();
                string strConnString = null;
                string strSQL = null;

                strConnString = "server=.;database=SMF570_Server;Trusted_Connection=false;uid=sa;pwd=mpa123;";
                objConn.ConnectionString = strConnString;
                objConn.Open();

                strSQL = "SELECT TOP(1000) * FROM VEHICLE_WEB_SERVICE";

                bool Isfind = false;
                SqlDataAdapter da;
                DataSet ds = new DataSet();
                string[] ArrData;
                try
                {

                    if (Isfind == true)
                    {
                        ds.Tables["strSQL"].Clear();
                    }
                    
                    da = new SqlDataAdapter(strSQL, objConn);
                    da.Fill(ds, "strSQL");
                    
                    int i = 0;
                    if (ds.Tables["strSQL"].Rows.Count != 0)
                    {
                        Isfind = true;
                        ArrData = new string[ds.Tables["strSQL"].Rows.Count];
                        
                        for (i = 0; i < ds.Tables["strSQL"].Rows.Count; i++)
                        {
                            ArrData[i] = ds.Tables["strSQL"].Rows[i]["V_WEB_SERVICE"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_LATITUDE"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_LONGITUDE"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_DIRECTION"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_SPEED"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_GPSDATE_UTC"].ToString() + "," +
                                         ds.Tables["strSQL"].Rows[i]["VLCTP_SATELLITE"].ToString();  
                        }
                            //ArrData[i] = ds.Tables["strSQL"].Rows[0]["V_WEB_SERVICE"].ToString() + " ทะเบียน " + ds.Tables["strSQL"].Rows[0]["V_LICENSE_NO"].ToString();

                        }
                        objConn.Close();
                        objConn = null;
            }
            catch(Exception e)
            {
                if (Properties.Settings.Default.logging == true)
                {
                    Logger.LogMessageToFile("Error Connecttion to Database: " + e.Message);
                }
            }

            if(ArrData != null)
            {
                try
                    {
                        string tmp = "";
                        char[] token = { ',' };
                        ProbeContainerEntity container = new ProbeContainerEntity();
                        container.ProbePointData = new List<ProbePointEntity>();
                        container.ProviderName = Properties.Settings.Default.provider;
                        int cntr = 0;
                        int j = 0;

                        for (j = 0; j < ArrData.Length ; j++)
                        {
                            tmp = ArrData[j];
                            
                            ProbePointEntity probePoint = new ProbePointEntity();
                            string[] values = tmp.Split(token);
                            probePoint.ProbeID = values[0];
                            probePoint.Lat = double.Parse(values[1]);
                            probePoint.Lon = double.Parse(values[2]);
                            probePoint.Heading = int.Parse(values[3]);
                            probePoint.Speed = values[4];
                            probePoint.Timestamp = values[5];
                            probePoint.Satellites = int.Parse(values[6]);

                                         //ArrData[i] = ds.Tables["strSQL"].Rows[i]["V_WEB_SERVICE"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_LATITUDE"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_LONGITUDE"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_DIRECTION"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_SPEED"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_GPSDATE_UTC"].ToString() + "," +
                                         //ds.Tables["strSQL"].Rows[i]["VLCTP_SATELLITE"].ToString() + "," +;  

                            container.ProbePointData.Add(probePoint);
                        }

                        //returns a string of the json data.
                        //null and default values do not get put into json object.
                        return JsonConvert.SerializeObject(container, Formatting.None,
                            new JsonSerializerSettings
                            {
                                NullValueHandling = NullValueHandling.Ignore,
                                DefaultValueHandling = DefaultValueHandling.Ignore
                            });
                    }
                    catch (Exception e)
                    {
                        Logger.LogMessageToFile("Error Connecttion to Database(Catch): " + e.Message);
                    }
            }
            return null;
        }