title: How to draw multiple ellipse in the same panel
body: <p>I am trying to draw some ellipse in the same panel, and the coordinators are determined by mouse click. Here is my code, this code can only draw one circle. The newer circle is always updating the older circle on the panel. So there is always only one circle.</p>
  
  <pre><code>private void panel1_MouseDown(object sender, MouseEventArgs e)
          {
  
              x = e.X;
              y = e.Y;
              panel1.Invalidate();
          }
          Graphics g;
          private void panel1_Paint(object sender, PaintEventArgs e)
          {
              g = panel1.CreateGraphics();
  
              g.FillEllipse(Brushes.Red, x,y, 10, 10);
          }
  </code></pre>