C # call WinRAR to realize compression and decompression

Using System.Diagnostics;
.............

{//************ compression *************
String strf= "Iis6.log";
String strr= "Newiis"; Compress package file name
Process P = new process ();
P.startinfo.filename= "Winrar.exe";
P.startinfo.createnowindow=false;

p.startinfo.arguments= "A-r" "+strr+" "+STRF; Default compression to RAR
p.startinfo.arguments= "A-afzip" "+strr+" "+STRF; Compress to zip
P.startinfo.arguments= "M" +strr+ "" +STRF; Compress to RAR and delete original file
p.startinfo.arguments= "a-p123456" "+strr+" "+STRF; Password is 123456

   
  {  //************ extract ************* 

//    p.startinfo.arguments= "x" +strr+ "" +strf; //from RAR uncompressed, file name to be consistent
//   p. startinfo.arguments= "x-p123456" +strr+ "" +strf; //Unzip the encrypted RAR
   
   /*     "x-o+" overwrites existing files
          "x-o-" does not overwrite existing files
          "x" + Strzippath + "  free1.txt" ' + strtxtpath  extract fr only from compressed package Ee1.txt, other files are not uncompressed
          "-y"    response to all inquiries is "yes", that is, errors do not pop-up windows
           "-CL"    Convert file name is lowercase     * */

   p.start ();
   if p.hasexited
   {
    int iExitCode = P.ExitCode;
    if (iexitcode = 0)
    {      MessageBox.Show ("normal completion");     }
    else
    {      messagebox.show ("error Complete");     }