[C#] 화면스크린 갭쳐

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp3
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Bitmap screenCaptureBitmap 
                = new Bitmap(Screen.PrimaryScreen.Bounds.Width
                           , Screen.PrimaryScreen.Bounds.Height);

            Graphics g = Graphics.FromImage(screenCaptureBitmap);
            Size sz = new Size(Screen.PrimaryScreen.Bounds.Width
                             , Screen.PrimaryScreen.Bounds.Height);
            g.CopyFromScreen(0, 0, 0, 0, sz);

            this.pictureBox1.Image = screenCaptureBitmap;
        }
    }
}