Add panels to site dynamically

Question

I have a main panel which is called linksAndPicturesPanel within this panel, I want to add more panels -> 1 panel for the link and 1 panel for a picture (red and green). Furthermore, it should be possible to add multiple links and pictures. To add those panels I use this code:

 Panel linkPanel = new Panel();
 linkPanel.CssClass = "linkList";
 linkPanel.Controls.Add(new LiteralControl("blablabla -----"));

 Panel picturePanel = new Panel();
 picturePanel.CssClass = "pictureFromLink";
 picturePanel.Controls.Add(new LiteralControl("blablabla22222 -----"));

 linksAndPicturesPanel.Controls.Add(linkPanel);
 linksAndPicturesPanel.Controls.Add(picturePanel);

This works fine for one line. After adding multiple lines, the page reloads and all lines exept the last one are gone. Is there a way, to prevent a page reload so that there all added items will be displayed ?