Hi Shiraj,

The easiest way to do this is to use a dashboard control, these are standard ascx usercontrols, you can then load a iFrame containing your existing aspx pages unless you can render existing usercontrols directly.

You do however need to consider security of your aspx pages and for this you need them to inherit from UmbracoEnsuredPage.

There is a great example for you of doing this in the source code to the Live Logger package which also uses a jquery plugin to resize the iFrame to be the same size as the containing dashboard even when resized.

Hope this is helpful to you,

Jeavon