String/object active outside public void

Hello C# people,

I have a question; how do i get my values outside of the button?

[code]using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Xml;
using System.IO;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using MySql.Data.MySqlClient;

namespace MySQL_verbinding
{
    public partial class MainFrame : Form
    {
        public MainFrame()
        {
            InitializeComponent();
        }

        public void button1_Click(object sender, EventArgs e)
        {
            string MyConString = "SERVER=localhost;" +
                "DATABASE=flessensysteem;" +
                "UID=root;" +
                "PASSWORD=1q2w3e;";
            MySqlConnection connection = new MySqlConnection(MyConString);           
        }


        public void get_Click(object sender, EventArgs e)
        {
            MySqlCommand command = connection.CreateCommand();
            MySqlDataReader Reader;
            command.CommandText = "select * from flessen";
            connection.Open();
            Reader = command.ExecuteReader();
            while (Reader.Read())
            {
                string thisrow = "";
                for (int i = 0; i < Reader.FieldCount; i++)
                    thisrow += Reader.GetValue(i).ToString() + ",";
                thisrow += ";";
                listBox1.Items.Add(thisrow);
            }
        }



        public void close_Click(object sender, EventArgs e)
        {
            connection.Close();
        }
}
}[/code]

error:
[code]Error    1    The name 'connection' does not exist in the current context    C:\**\MySQL verbinding\MainFrame.cs    34    36    MySQL verbinding
Error    2    The name 'connection' does not exist in the current context    C:\**\MySQL verbinding\MySQL verbinding\MainFrame.cs    37    13    MySQL verbinding
Error    3    The name 'connection' does not exist in the current context    C:\**\MySQL verbinding\MySQL verbinding\MainFrame.cs    53    13    MySQL verbinding
[/code]