Immigration Question

[netpicker9]

Hi,

I applied for Canadian Immigration last year. This is I got my H1B stamped and came to US, Now I need update my Information to Canadian Immigration Office..

My doubt is after coming to US, I changed my employer. So, now do I need to inform Immigration about my change in employer also? Do I need to send them new I797 copy?

or just my Old visa which stamped on my passport is enough?

let me know.

Thanks