c# dbclass study

DBconnect.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;

// require mysl.data on references
// author besingamk 

namespace testentity
{
    class DBconnect
    {
        private MySqlConnection connection;
        private string server;
        private string database;
        private string uid;
        private string password;

        public DBconnect()
        {
            Initialize();
        }

        private void Initialize()
        {
            server = "localhost";
            database = "family";
            uid = "root";
            password = "";
            string connectionString;
            connectionString = "SERVER=" + server + ";" + "DATABASE=" + database + ";" + "UID=" + uid + ";" + "PASSWORD=" + password + ";";

            connection = new MySqlConnection(connectionString);
        }
        
        // open connection to database
        private bool OpenConnection()
        {
        }

        // close connection to database
        private bool CloseConnection()
        {
        }

        // insert statement
        public void insert()
        {
        }

        // update statement
        public void update()
        {
        }

        // delete statement
        public void delete()
        {
        }

        // select statement
        public List<string>[] select()
        {
        }

        //backup statement
        public void backup()
        {
        }

        // restore 
        public void restore()
        {
        }
    }
}