Urgent! F1 - H1 in Canada

Hello everyone,

Need an urgent help. I am a F-1 holder and would like to apply my H1-B visa in Canada. I heard that only the same vis-category application will be accepted. That means, F1-F1, H1-H1, but not F1-H1. Is this true? Is there anybody actually go there recently with the same case and got visa? Thanks so much for the help.