connection Mysql c# some misunderstanding

mysql> CREATE USER 'myuser'@'localhost' IDENTIFIED BY 'mypass';//created.

mysql> create database mydat;//created
mysql> USE mydat; /database changed;
mysql>create table mytb(one int, two int); //created
mysql> insert into mytb(one , two )VALUE (10, 15);
mysql> select * from mytb;
+------+------+
| one  | two  |
+------+------+
|   10 |   15 |
|   10 |   15 |
|   10 |   15 |
+------+------+

  using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace Full_Apl_Of_Storage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void btnDelete_Click(object sender, EventArgs e)
        {
                        string MyConString=("SERVER=localhost;DATABASE=mydb;UID=myuser;PASSWORD=mypass;");

			MySqlConnection connection = new MySqlConnection(MyConString);
			MySqlCommand command = connection.CreateCommand();
			MySqlDataReader Reader;
			command.CommandText = "select * from mytb;";
			connection.Open();
			Reader = command.ExecuteReader();
			while (Reader.Read())
			{
				string thisrow = "";
				for (int i= 0;i<Reader.FieldCount;i++)
						thisrow+=Reader.GetValue(i).ToString() + ",";
				listBox1.Items.Add(thisrow);
			}
			connection.Close();
		}
        }

            
    
}