[C#] Windows 창 가지고 놀기

그냥 Windows 창 가지고 놀기 -_-

using System;
using System.Windows.Forms;
using System.Drawing;

class QuizForm : Form
{
    QuizForm()
    {
        this.Text = "Window 창 가지고 놀기 By RyuiSaka";
        this.BackColor = Color.BlanchedAlmond;
        this.Width *= 2;
        this.Height /= 2;
        this.FormBorderStyle = FormBorderStyle.FixedSingle;
        this.MaximizeBox = false;
        this.Cursor = Cursors.Hand;
        this.StartPosition = FormStartPosition.CenterScreen;

    }

    static void Main()
    {
        QuizForm quizForm = new QuizForm();
        Application.Run(quizForm);
    }

    protected override void OnKeyDown(KeyEventArgs e)
    {
        switch(e.KeyCode)
        {
            case Keys.Left :
                if(e.Control)   this.Width = this.Width - 5;
                else            this.Location = new Point(this.Location.X - 5, this.Location.Y);
                break;
            case Keys.Right :
                if(e.Control)   this.Width = this.Width + 5;
                else            this.Location = new Point(this.Location.X + 5, this.Location.Y);
                break;
            case Keys.Up :
                if(e.Control)   this.Height = this.Height - 5;
                else            this.Location = new Point(this.Location.X, this.Location.Y - 5);
                break;
            case Keys.Down :
                if(e.Control)   this.Height = this.Height + 5;
                else            this.Location = new Point(this.Location.X, this.Location.Y + 5);
                break;
            case Keys.Enter :
                if (e.Alt)          this.WindowState = FormWindowState.Maximized;
                else if (e.Control) this.WindowState = FormWindowState.Minimized;
                else if (e.Shift)   this.WindowState = FormWindowState.Normal;
                break;
        }
    }
}