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

            DataSet ds = new DataSet();

            ClsBAL objBal = new ClsBAL();
            ds = objBal.GetAgents();

            string filteringquery = "Username 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]["Username"].ToString().Trim());
            }

            return airports.ToArray();

        }
        catch (Exception)
        {
            throw;

        }
    }
 DataSet GetAgents()
 {
     try
     {
         ClsBAL objbal = new ClsBAL();
         return objbal.GetAgents();
     }
     catch (Exception ex)
     {
         // lblMsg.InnerHtml = ex.Message;
         throw;
     }
 }