... So, Can I stay In Canada after court marriege ?? If yes, then on what status it might be ?? Is it consider legally ??
You can stay in Canada for the length of time given to you on the visitor visa (unless the border official gives you less when you enter Canada, which is unlikely). You will be a visitor, and it is perfectly legal. You can apply to extend your stay.
Once you are married your wife can apply to sponsor you. Outland is fastest, so I recommend that. That means the application is first sent to Mississauga (in Canada); then, if your wife is approved as a sponsor, they will send it to the visa office you choose to process it: either in your country of citizenship (New Delhi) or in Buffalo (but only if you were admitted to the USA on a visa good for one year or more). Make sure, if you choose Buffalo, that you will be able to get back in to the USA, because there is a good chance you will be called for an interview. If they call you for an interview, and you can't get back into the country for it, they will just refuse your visa. Applications processed through New Delhi are generally done more quickly than those through Buffalo.