C#

public static string GetCPUId()
{
    string cpuInfo = string.Empty;

    ManagementClass mgr = new ManagementClass("Win32_Processor");
    ManagementObjectCollection mgrCollection = mgr.GetInstances();

    foreach (ManagementObject mgrItem in mgrCollection)
    {
        if (cpuInfo == string.Empty)
        {
            cpuInfo = mgrItem.Properties["ProcessorId"].Value.ToString();
            break;
        }
    }

    return cpuInfo;
}

Pen p = new Pen(Color.Red, 5);<br />
g = pictureBox2.CreateGraphics();<br />
g.DrawEllipse(p, e.X, e.Y, 5, 7); 

Bitmap bmp = new Bitmap(pictureBox2.Width, pictureBox2.Height);<br />
Graphics g = Graphics.FromImage(bmp);<br />
Pen p = new Pen(Color.Red, 5);<br />
g.DrawEllipse(p, e.X, e.Y, 5, 7); <br />
pictureBox2.Image = bmp;

private void pictureBox2_MouseDown(object sender, MouseEventArgs e)<br />
        {   <br />
            if (e.Button == MouseButtons.Left)<br />
            {<br />
Bitmap bmp = new Bitmap(pictureBox2.Width, pictureBox2.Height);<br />
<br />
Graphics g = Graphics.FromImage(bmp);<br />
<br />
Pen p = new Pen(Color.Red, 5);<br />
<br />
g.DrawEllipse(p, e.X, e.Y, 5, 7); <br />
           }

if (saveFileDialog1.ShowDialog() == DialogResult.OK)<br />
            {<br />
pictureBox2.Image = bmp;<br />
<br />
pictureBox2.Image.Save(saveFileDialog1.FileName);