Code for a section of ASP. Net DES encryption decryption

Encryption

public string Desencrypt (string strText, String strencrkey)   {    byte[] bykey=null;    Byte[] iv= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};    Try    {     Bykey = System.Text.Encoding.UTF8.GetBytes (strencrkey.substring (0,8));     DESCryptoServiceProvider des = new DESCryptoServiceProvider ();     Byte[] Inputbytearray =system.text.encoding.utf8.getbytes (strText);     MemoryStream ms = new MemoryStream ();     CryptoStream cs = new CryptoStream (MS, Des. CreateEncryptor (Bykey, IV), cryptostreammode.write);     Cs. Write (Inputbytearray, 0, inputbytearray.length);     Cs. FlushFinalBlock ();     Return convert.tobase64string (Ms. ToArray ());    }    catch (System.Exception error)    {     MessageBox.Show (Error). Message);     Return "error:" +error. Message+ "/R";    }   }

Decrypt

public string Desdecrypt (String strtext,string sdecrkey)   {    byte[] bykey = null;    Byte[] iv= {0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF};    byte[] Inputbytearray = new Byte[strtext.length];    Try    {     Bykey = System.Text.Encoding.UTF8.GetBytes (sdecrkey.substring (0,8));     DESCryptoServiceProvider des = new DESCryptoServiceProvider ();     Inputbytearray = convert.frombase64string (strText);     MemoryStream ms = new MemoryStream ();     CryptoStream cs = new CryptoStream (MS, Des. CreateDecryptor (Bykey, IV), cryptostreammode.write);     Cs. Write (Inputbytearray, 0, inputbytearray.length);     Cs. FlushFinalBlock ();     System.Text.Encoding Encoding = new System.Text.UTF8Encoding ();     return encoding. GetString (Ms. ToArray ());    }    catch (System.Exception error)    {     MessageBox.Show (Error). Message);     Return "error:" +error. Message+ "/R";    }   }