Can you exlain for me this code below

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace ProgrammerGuide_001
{
    public class WinForm:Form
    {
        private Button button1;
        private TextBox textBox1;
        public WinForm()
        {
        }
        static void Main(string[] args)
        {
            WinForm myFrm = new WinForm();
            myFrm.button1 = new Button();
            myFrm.textBox1 = new TextBox();
            myFrm.Text = "my first window application";
            Application.Run(myFrm);
        }
    }
}

I have a question that when I declare 2 object variable like this:

private Button button1;
private TextBox textBox1;

why I can't instantiate with the following statements:

button1=new Button();
textBox1=new TextBox();

but this code can:

myFrm.button1 = new Button();
myFrm.textBox1 = new TextBox();

Tags: C#