QueueSys/QueueSys/SqliteDataAccess.cs

using Dapper;
using System;
using System.Collections.Generic;
using System.Configuration;
using System.Data;
using System.Data.SQLite;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace QueueSys
{
    public class customerView
    {
        public string customerName { get; }
        public string status { get; }
        public string timeElapsed { get; }
    }

    public class employeeView
    {
        public int id { get; }
        public string customer_name { get; set; }
        public int num_bags { get; set; }
        public string employee { get; set; }
        public string status { get; set; }
    }

    public class SqliteDataAccess
    {
        public static List<employeeView> loadEmployeeView()
        {
            string strQuery = "SELECT id,customer_name,num_bags,employee,status FROM active_customers;";

            //A using statement protects us as a failsafe: it guarantees the connection to the
            //database will be closed, even in event of an application or computer crash.
            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
            {
                var output = cnn.Query<employeeView>(strQuery, new DynamicParameters());
                return output.ToList();
            }
         }

        public static List<customerView> loadCustomerView()
        {
            string strQuery = "SELECT customer_name,status FROM active_customers;";

            using (IDbConnection cnn = new SQLiteConnection(LoadConnectionString()))
            {
                var output = cnn.Query<employeeView>(strQuery, new DynamicParameters());
                return output.ToList();
            }
        }

        public static void saveCustomer(employeeView customer)
        {

        }

        private static string LoadConnectionString(string id="Default")
        {
            return ConfigurationManager.ConnectionStrings[id].ConnectionString;
        }
    }
}