Getting a path of a running process by name

How can I get a path of a running process by name? For example, I know there is a process named "notepad" running, and I want to get the path of it. How to get the path without looping through all other processes?

Not this way!

using System.Diagnostics;

foreach (Process PPath in Process.GetProcesses())
{
    if (PPath.ProcessName.ToString() == "notepad")
    {
        string fullpath = PPath.MainModule.FileName;
        Console.WriteLine(fullpath);
    }
}