@Bondige-Ramesh ,
I am sorry you are having difficulty. Assuming you mean “Notepad++”, not “Notepad” (they are two different applications – Notepad++ is what’s discussed in this forum; Microsoft’s notepad.exe is a separate product, and is not the focus of this forum)
please share your ?-menu’s Debug Info, so we know what version of Notepad++ you are using, and get some useful information to help us replicate and diagnose your problem
please be more specific than saying “suddenly loaded as empty” over and over.
If it’s just a matter of you had a file, then accidentally deleted its contents, there is not much we can do to help you: we have a FAQ about backups, which gives a couple places to look, depending on what your Notepad++ backup settings are. But the chances are, now that the file loads empty, you have likely lost your data.