Question

if we copy a text then its placed in the clipboard, and we are pasting it for the second time we are copying a new one and the old one is overwritten.... can we paste a previously copied text is there any possiblity....??

Answer 1

In some cases you can look at the clipboard and you will be able to use old copies.
Run > clpbrd.exe and hit enter.
In some cases it is just overwritten though.

Answer 2

:P

Answer 3

You might want to check out "Clipboard Manager": http://www.howtogeek.com/howto/19420/store-multiple-items-to-clipboard-in-windows/