A c# program that login at facebook when we provide our userid and Password

A c# program that login at facebook when we provide our userid and Password

what I have done so far is by Process class i m able to open chrome and
and then Facebook but now I have to log in at Facebook, so how can i done
this by pro grammatically
Process p1 = new Process();
p1.StartInfo.FileName = "chrome.exe";
p1.StartInfo.Arguments = url_tb.Text;
p1.Start();