WPF Couldn't load fonts from resources

I want to load my fonts from Resources folder and i wrote this code for that.

<TextBlock Margin="0,10,0,0"  FontFamily="/Resources/#IRRoya" FontSize="14" Text="پایگاه داده های موجود : "/>

in design everything is OK, but when i run the project, this code doesn't work. i also forced my program to run with administrator privilege level, but it still doesn't work.