I have created one content type and list along with module (as aspx) page in visual studio , Now when I click on new item of list then i can open the newly created form but I want something like, when I select content type then it should open some other aspx page what should i do? please guide
Have a look here on MSDN. I think FormUrls can be of help in your case.
This schema enables you to specify client-side redirects to different Display, Edit, and New form pages for items of this content type.
another way would be to load the newform.aspx witin sharepoint designer and ammending it that way through code and adding an event to its control to trigger a new page or redirect!
i dont think you could use an item added event or adding as that is for the list as a whole rather than idividual item to load aspx.