How to Learn WPF (Security)-C # symmetric encryption algorithms

1   Private Symmetricalgorithm mobjcryptoservice;
 2   Private   String Key;
 3   ///  //  <Summary>  
  4   ///  // Constructor of symmetric encryption
  5   /// //  </Summary>  
  6   Public Symmetricmethod (){
 7 Mobjcryptoservice = New Rijndaelmanaged ();
 8 Key = "  Guz (% & hj7x89h $ yubi0456ftmat5 & fvhufcy76 * H % (hilj $ lhj! Y6 & (* jkp87jh7  " ;
 9 }
 10  ///     <Summary>   
  11   ///  Get key
  12   ///     </Summary>  
  13   ///    <Returns>  Key  </Returns>     
  14   Private  Byte [] Getlegalkey ()
 15 { String Stemp = key; mobjcryptoservice. generatekey ();
 16   Byte [] Byttemp = mobjcryptoservice. Key; Int Keylength = byttemp. length;
 17   If (Stemp. length> keylength) stemp = stemp. substring ( 0 , Keylength );
 18   Else  If (Stemp. Length <keylength) stemp = stemp. padright (keylength, '    ' );
 19  Return Asciiencoding. ASCII. getbytes (stemp );
 20 }
 21   ///     <Summary>   
  22   ///  Obtain the initial vector IV
  23   ///    </Summary>  
  24   ///     <Returns>  Initial test vector IV  </Returns>     
  25   Private  Byte [] Getlegaliv (){
 26  String Stemp = "  E4ghj * ghg7! Rnifb & 95guy86gfghub # er57hbh (U % g6hj ($ jhwk7 &! Hg4ui % $ hjk  " ;
 27 Mobjcryptoservice. generateiv ();
 28   Byte [] Byttemp = mobjcryptoservice. IV;
 29   Int Ivlength = byttemp. length;
 30   If (Stemp. length> ivlength)
 31 Stemp = stemp. substring ( 0 , Ivlength );
 32   Else  If (Stemp. Length <ivlength)
 33 Stemp = stemp. padright (ivlength, '     ' );
 34  Return Asciiencoding. ASCII. getbytes (stemp );
 35 }
 36  
 37   ///     <Summary>   
  38   ///  Encryption Method
  39   ///     </Summary> 
  40   ///  <Param name = "Source">  String to be encrypted  </Param>  
  41   ///     <Returns>  Encrypted string  </Returns>     
  42  Public  String Encrypto ( String Source ){
 43   Byte [] Bytin = utf8encoding. utf8.getbytes (source );
 44 Memorystream MS = New Memorystream ();
 45 Mobjcryptoservice. Key = getlegalkey ();
 46 Mobjcryptoservice. IV = getlegaliv ();
 47 Icryptotransform encrypto = mobjcryptoservice. createencryptor ();
 48 Cryptostream cs = New Cryptostream (MS, encrypto, cryptostreammode. Write );
 49 CS. Write (bytin, 0 , Bytin. Length );
 50 CS. flushfinalblock ();
 51 Ms. Close ();
 52  Byte [] Bytout = Ms. toarray ();
 53   Return Convert. tobase64string (bytout );
 54 }
 55  
 56  
 59   ///     <Summary>   
  60   /// Decryption Method
  61   ///    </Summary>  
  62   ///     <Param name = "Source">  String to be decrypted  </Param>  
  63   ///    <Returns>  Decrypted string  </Returns>     
  64   Public  String Decrypto ( String Source)
 65 {
 66   Byte [] Bytin = convert. frombase64string (source );
 67 Memorystream MS = New Memorystream (bytin, 0 , Bytin. Length );
 68 Mobjcryptoservice. Key = getlegalkey ();
 69 Mobjcryptoservice. IV = getlegaliv ();
 70 Icryptotransform encrypto = mobjcryptoservice. createdecryptor ();
 71 Cryptostream cs = New Cryptostream (MS, encrypto, cryptostreammode. Read );
72 Streamreader sr = New Streamreader (CS );
 73   Return Sr. readtoend ();
 74 }

How to use it. If you know the basic C # syntax, it should be used. I believe you