how to solve blurred images on mouseclick in windows form in C#

private void button1_Click(object sender, EventArgs e)
    {
        int j;
        openFileDialog1.Multiselect = true;


        if ( openFileDialog1.ShowDialog() == DialogResult.OK)
        {
                   string[] file =  openFileDialog1.FileNames;

                   // To put the first image selected in pictureBox1
                   Image img = Image.FromFile(file[0]);
                   Image img1 = ResizeImage(img,pictureBox1.Width,pictureBox1.Height);
                   pictureBox1.Image = img1;


                   //to put the rest of images selected, in pictureboxes present in flowlayoutpanel 
                   // textbox1 to limit the number of images according to user.
                   for( j=0 ;j< Convert.ToInt32(textBox1.Text) ;j++)
                   {
                     try
                     {
                        PictureBox pb = new PictureBox();
                        Image loadedimage1 = Image.FromFile(file[j]);

                        pb.Size = new System.Drawing.Size(100, 100);
                        Image img3 = ResizeImage(loadedimage1, pb.Width, pb.Height);
                        pb.Image = img3;

                         flowLayoutPanel1.Controls.Add(pb);
                        pb.MouseClick += new MouseEventHandler(picturebox_load);

                     }
                     catch (Exception ex)
                     {
                          MessageBox.Show(". You may not have permission to read the file, or " +
                            "it may be corrupt.\n\nReported error: " + ex.Message);
                     }
                 }

         }


    }

    // load image on mouseclick in picturebox1
    public void picturebox_load(object sender, MouseEventArgs e)
    {
        PictureBox pb = (PictureBox)sender;
        Image img2 = pb.Image;
        Image img3 = ResizeImage(img2, pictureBox1.Width, pictureBox1.Height);
        pictureBox1.Image = img3;

    }

    public static System.Drawing.Bitmap ResizeImage(System.Drawing.Image image, int width, int height)
    {
        //a holder for the result 
        Bitmap result = new Bitmap(width, height);

        //use a graphics object to draw the resized image into the bitmap 
        using (Graphics graphics = Graphics.FromImage(result))
        {
            //set the resize quality modes to high quality 
            graphics.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
            graphics.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
            graphics.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
            //draw the image into the target bitmap 
            graphics.DrawImage(image, 0, 0, result.Width, result.Height);
        }

        //return the resulting bitmap 
        return result;
    }