It doesn't quite work like that.
We do not do your work for you.
If you want someone to write your code, you have to pay - I suggest you go to Freelancer.com and ask there.
But be aware: you get what you pay for. Pay peanuts, get monkeys.
Either that, or start with Google and search for "face recognition C#"
That will come up with loads of links, some of which are here on this site:
Multiple face detection and recognition in real time[
^]
Camera Face Detection in C# using Emgu CV and WPF[
^] will give you some of the very basics.
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