public static string[] GetAirportCodes(string prefixText)
    {
        try
        {

            DataSet ds = new DataSet();

            FlightBAL objFlightBal = new FlightBAL();
            ds = objFlightBal.GetAirportCodes();

            string filteringquery = "CityName LIKE'" + prefixText + "%'";
            //Select always return array,thats why we store it into array of Datarow
            DataRow[] dr = ds.Tables[0].Select(filteringquery);
            //create new table
            DataTable dtNew = new DataTable();
            //create a clone of datatable dt and store it into new datatable
            dtNew = ds.Tables[0].Clone();
            //fetching all filtered rows add add into new datatable
            foreach (DataRow drNew in dr)
            {
                dtNew.ImportRow(drNew);
            }
            //return dtAirportCodes;

            List<string> airports = new List<string>();
            for (int i = 0; i < dtNew.Rows.Count; i++)
            {
                airports.Add(dtNew.Rows[i]["CityName"].ToString().Trim() + "," + dtNew.Rows[i]["AirportDesc"].ToString().Trim() + " - (" + dtNew.Rows[i]["AirportCode"].ToString().Trim() + ")");
            }
            return airports.ToArray();
        }
        catch (Exception)
        {
            throw;

        }
    }