Which type of applications can use WebParts ? 
I tried using webparts on an asp.net webpage and got a blank screen. While googling, I came across this link 

http://stackoverflow.com/questions/2672535/simple-web-parts-in-asp-net-show-as-blank-page

which made me wondering, which type of applications should ideally use WebParts ? 
Please share your real world experiences.
Which type of applications can use WebParts ? 
===

I tried using webparts on an asp.net webpage and got a blank screen. While googling, I came across this link 

http://stackoverflow.com/questions/2672535/simple-web-parts-in-asp-net-show-as-blank-page

which made me wondering, which type of applications should ideally use WebParts ? 
Please share your real world experiences.