I had applid for US Green Card 5 yrs back and my I485 is still pending. In the mean time, also applied for CA Green Card which is also at the final phase. I  am hoping both will be approved almost at the same time.

Now my question is, Is it allowed to keep both Green cards? I  know US allows dual citizenship but here the case is different. Somewhere I read that, you have to give up one if you receive another- not sure how true is that. I know there are few restrictions of stay period, you need to stay at least 2 yrs in CA to keep PR or things like that. 

Haina Team Player, chi chi pani papa ni!Hami lai kehi chhodnu paryo ni!

No. As soon as you acquire a different country's PR, your GC status gets terminated. 

@bidroh, how sure are u about that? Mr.player is talking about permanent residency not citizenship.
I am 99% sure u can keep pr card of as many countries. But you won't be able to fulfill the requirements to keep your permanent residency valid because they don't let you stay out of their country for more than a couple of years(most countries). But you can easily keep pr of Canada and USA. You must stay in Canada for 2 years in a five year period. In USA you must be back at every six months unless you take pre-approval for longer stay out of the country.

Appreciate your inputs. But guys how are you so sure about whether or not we can keep it? I have been looking in forums and immigration website I couldn't find anything on this. Can you please provide some links or share any personal experience? 

Team Player Som:

There is nothing that stops you from obtaining Permanent Residency of both Canada and USA. Technically, there is no difference between a VISA without any restriction and a permanent residency. Just like obtaining visas for more than one country is perfectly legal and valid, the same applies to the residency status. However there is once catch, as one of the responders mentioned above. The permanent residency comes with an implicit condition that you have full intention to live in that country for a foreseeable future. If you don't, then you should not really have obtained the permanent residency. With that in mind, the governments of these countries require that you live in those countries for a minimum period of time within 5 years period. In Canada's case, it is 2 or 3 (not sure) you must live in that country. The US is more restrictive. If you live outside of the country for more than a year consecutively, then you may lose your permanent residency. With such conditions and the reality that you have to maintain your regular business or job in the country you live, holding the two permanent residency becomes unsustainable. Hope this answers your question...

//YoTaBhayanaNiSom

I stand corrected.....

Birodh: That may be how it works legally but I suspect if they have any means to enforce it. I have held PR of both countries and have never had trouble travelling on either one until one of them expired...

yota, 

Birodh Som:

If you are asking about how they calculate the number of days you have remained in the country for your citizenship eligibility, the timeline does not get reset regardless of your entry and exit from the country. As long as you maintain your PR status, they deduct the number of days you have been outside of the country and only count the days you have actually spent in the country to work out your eligiblity. That's how it works in Canada. I think US system needs you to maintain your PR status for 5 years, regardless of number of days spent outside of the country, but I am not 100% sure on US one. Further, in Canada, they actually give you 1/2 credit for each day you spent in that country before you actually obtained your PR within past 4 or 5 years... I hope this answers your Q.

//YoTaBhayanaNiSom

Thanks yota bro, thats exactly what I wanna hear. I just don't wanna give up one soon I get another.