C# process code

Question

    I have questions to ask about the following C# 2008/2010 code listed below:
    Process eProcess = new Process();                     
    eDataContext rData = new eDataContext();
                string[] PkgIDs = rData.Trans.Select(c => c.Package_ID ).ToArray();
                 
                foreach (string PkgID in PkgIDs)
                {
                
                    eProcess.StartInfo.FileName = "app1.exe";
                    eProcess.StartInfo.Arguments = "10 " + " 5" + PkgID;
                    eProcess.Start();
                    eProcess.WaitForExit();
                    eProcess.Close();
                 }

    My questions are the following:
    1. After the  eProcess.WaitForExit(); line of code is finished waiting for the process to finish executing, is there a way to check for the condition code returned from the run. I basically want to see if the job that executed ran successfully. If so, can you tell me how to setup that code?
    2. Do I need the line of code "eProcess.Close();"/ Why or why not?
    3. I am basically looping thoough calls executing a process based upon values received in PkgID that is stored in a database table. Is this code good or not? Can you tell me why or why not? If the code is not good, can you tell me a better way to
write the code?