Hi i like to develop iphone application. how to develop the iphone application in linux or window. please do reply me.
Sorry you can't develop iPhone apps on Linux or Windows, You need to have the iPhone SDK and XCode installed on a Mac.
You can find some fairly cheap Mac's on ebay though, so don't lose heart. Make sure you get an intel based one. With a bit of looking you should be able to find a mac mini or macbook for a reasonable price.
Quick answer is:
You can't, it needs to be on a Mac
Unless, you want to develop applications for jailbroken models, and in this case, I'd check here
Take at look at this question:
But I would recommend you grab a mac mini from ebay and use that. It'll make your life a lot easier
virtual machines could be a solution if you don't want to buy new hardware:
http://www.ihackintosh.com/2009/12/install-snow-leopard-in-vmware-7-windows-edition/