i have solved the problem
Firstly, i have learned that System.Diagnotistic.Process.Start(string ,string) takes two parameters that are strings. I set the first parameter to exe file and second parametre to combine of all others parametres as
string parameter = acw.username + "," + acw.password + "," + acw.FileName + "," + acw.FilePath;
string path = "C:\\Users\\ersin\\Desktop\\Projeler\\FileCatalyst\\FileCatalyst\\bin\\Debug\\FileCatalyst.exe";
var process = Process.Start(path, parameter);
And at the exe part i split the parameter by comma and get all variables