Parse out controls from your html page.

Tip - Never use type equality because that does not support derived classes:

if (item.GetType() == typeof(Image)) //this is bad, mkay.

Instead use the following which does support derived classes:

if (item is Image)

The Microsoft prefered pattern (when you actually need the cast object) is:

var itemAsType = item as Image;
if (itemAsType != null)

That way, you will only have to typecast once.