private void fillAllWorkersList(string org_name)
    {
        SqlConnection conn = new SqlConnection(getConnectionString());
        string sql = "SELECT DISTINCT [ID], [First Name], [Last Name] FROM [Worker] WHERE [Organization Name] = '" + org_name + "'";
        try
        {
            conn.Open();
            SqlCommand cmd = new SqlCommand(sql, conn);

            SqlDataReader myReader = cmd.ExecuteReader();
            while (myReader.Read())
            {
                Worker allWorker = new Worker(null, null, null);
                allWorker.setWorker_ID(myReader[0].ToString().Trim());
                allWorker.setFirst_Name(myReader[1].ToString().Trim());
                allWorker.setLast_Name(myReader[2].ToString().Trim());
                allWorkersList.AddWorker(allWorker);
            }
        }
        catch (System.Data.SqlClient.SqlException ex)
        {
            string msg = "Insert Error:";
            msg += ex.Message;
            throw new Exception(msg);
        }
        finally
        {
            conn.Close();
        }
    }