Starting another process with elevation using different user credentials
ProcessStartInfo info = new ProcessStartInfo(path);

info.UseShellExecute = false;
info.UserName = username;
info.Password = securePwd;
info.Domain = "MyDomain";
info.Verb = "runas";

var proc = Process.Start(info);

ProcessStartInfo info = new ProcessStartInfo(path);

info.UseShellExecute = false;
info.UserName = username;
info.Password = securePwd;
info.Domain = "MyDomain";
info.Verb = "runas";
info.WorkingDirectory = "c:\directory\contains\process_to_be_started"

'var proc = Process.Start(info);

Process proc = Process.Start(info);