Hi,
I knw its a silly question, but am a newbie to 'vi' editor. I'm forced to use this, hence kindly help me with this question.
How can i paste a chunk 'copied from' a different editor(gedit) in 'vi editor'?
As i see, p & P options does work only within 'vi'.
If you are using an X-Windows environment of some sort then middle-click usually pastes into a terminal session.
Sometimes shift-insert will do it too.
Yes, but Middle-click or shift-insert isn't working within 'vi' editor.
It works in gedit.
Are you in X-Windows? Or connected via SSH/PuTTY or similar? I'm not familiar with gedit... is it a GUI application? In other words... when you copy something to the clipboard from gedit... which clipboard is it going to?
am not sure of what u're asking. Gedit is a GUI based editor(like ur notepad in windows)
Okay, so I take it you are not in Windows... are you using VNC or something to connect to a remote server? Or are you directly in front of a PC running Linux with KDE or Gnome or something? And if that is the case, how are you running vi, in an xterm window? Or konsole? Maybe a screenshot would tell a thousand words... 
yes .. My OS is windows & am using exceed to login onto a unix server. Now i wanna copy text from windows to exceed(Normally in this scenario middle-click works, but its not working when i try to paste it in 'vi' editor. I wonder y ?!
Are you aware that you need to put vi in insert mode by pressing "i" before you can enter (or paste) text into it?
Are you able to paste text into the terminal when it is not running vi? e.g. if you run cat instead?
Yes .. i knw .. I got an alternative solution to this !
Copy the text from windows to gedit & in gedit, highlight the text (Just select the text, don't do copy(ctrl-c)) u wanna copy & in vi use middle-click(In Inset mode). This works !!
Hmm... yes, unfortunately I think there are multiple clipboard standards for X applications... the standard X way was the way you describe where you highlight text causing it to be automatically "copied", and middle-click to paste. Then some apps have an Edit menu with the Windows-style copy and paste options, and in some cases they seem to share the X clipboard, and in some cases they use a separate one.