get screenshot

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Windows.Forms;

namespace ScreenShot
{
  public class Screen
  {
    public static void PrintScreen()
    {
      var bmpScreenShot = new Bitmap(Screen.PrimaryScreen.Bounds.Width, Screen.PrimaryScreen.Bounds.Height);
      var g = Graphics.FromImage(bmpScreenShot);
      g.CopyFromScreen(Screen.PrimaryScreen.Bounds.X, Screen.PrimaryScreen.Bounds.Y, 0, 0, bmpScreenShot.Size, CopyPixelOperation.SourceCopy);

      var imagePath = System.IO.Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments), "screenshot.png");
      bmpScreenShot.Save(imagePath, ImageFormat.Png);
    }
  }
}