How to get result message from System.Diagnostics.Process

Hello

I call .exe file via Unity. It is my code.

     System.Diagnostics.ProcessStartInfo info = new System.Diagnostics.ProcessStartInfo();
     info.FileName = program_name;
     info.WorkingDirectory = file;
     info.Arguments = command;
     if(windowtype_hidden){
         info.WindowStyle = System.Diagnostics.ProcessWindowStyle.Hidden;
     }

     try{
         process = System.Diagnostics.Process.Start(info);
     }catch(System.ComponentModel.Win32Exception w){
         Debug.Log("Not Found." + w);
         message = "Not Found.";
         return_num = 0;
         return false;
     }

But, I don't know how to get result message from the System.Diagnostics.Process.

Could you tell me how to get?

Later, I will develop for Mac and Windows and Android.