C# PictureBox and Crop Image

	
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 PictureBox_Crop_Image
{
  public partial class Form1 : Form
  {
    int xDown = 0;
    int yDown = 0;
    int xUp = 0;
    int yUp = 0;
    Rectangle rectCropArea = new Rectangle();
    System.IO.MemoryStream ms = new System.IO.MemoryStream();
    Task timeout;
    string fn = "";
    public Form1()
    {
      InitializeComponent();
    }

    private void selectIm_Click(object sender, EventArgs e)
    {
      OpenFileDialog opf = new OpenFileDialog();
      if (opf.ShowDialog() == DialogResult.OK)
      {
        pictureBox1.Image = Image.FromFile(opf.FileName);
        fn = opf.FileName;
      }
      pictureBox1.Cursor = Cursors.Cross;
    }

    private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
    {
      //pictureBox1.Image.Clone();
      xUp = e.X;
      yUp = e.Y;
      Rectangle rec = new Rectangle(xDown, yDown, Math.Abs(xUp - xDown), Math.Abs(yUp - yDown));
      using (Pen pen = new Pen(Color.YellowGreen, 3))
      {

        pictureBox1.CreateGraphics().DrawRectangle(pen, rec);
      }
      rectCropArea = rec;
      crop.Enabled = true;
    }

    private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
    {
      pictureBox1.Invalidate();

      xDown = e.X;
      yDown = e.Y;
      crop.Enabled = true;
    }

    private void crop_Click(object sender, EventArgs e)
    {
      try
      {
        pictureBox2.Refresh();
        //Prepare a new Bitmap on which the cropped image will be drawn
        Bitmap sourceBitmap = new Bitmap(pictureBox1.Image, pictureBox1.Width, pictureBox1.Height);
        Graphics g = pictureBox2.CreateGraphics();

        //Draw the image on the Graphics object with the new dimesions
        g.DrawImage(sourceBitmap, new Rectangle(0, 0, pictureBox2.Width, pictureBox2.Height), rectCropArea, GraphicsUnit.Pixel);
        sourceBitmap.Dispose();
        crop.Enabled = false;
        var path = Environment.CurrentDirectory.ToString();
        ms = new System.IO.MemoryStream();
        pictureBox2.Image.Save(ms, System.Drawing.Imaging.ImageFormat.Png);
        byte[] ar = new byte[ms.Length];
        var timeout = ms.WriteAsync(ar, 0, ar.Length);

      }
      catch (Exception ex)
      {

      }
    }

  }
}