C#BASE64 Encoding decoding __ Code

Using System;
Using System.Collections.Generic;
Using System.Linq;

Using System.Text;  Namespace Cat8637callcenter {public class CBase64 {///<summary>///encrypts the string using the Base64 algorithm/// </summary>///<param name= "Code_type" > Encoding type (encoded name)///* code page name///* 1200 "utf-16l" E "," utf-16 "," ucs-2 "," Unicode "or" iso-10646-ucs-2 "///* 1201///<summary>///use BAS for strings 
        E64 algorithm encryption///</summary>///<param name= "Code_type" > Encoding type (encoded name)///* code page name 
        * 1200 "Utf-16le", "utf-16", "ucs-2", "Unicode" or "iso-10646-ucs-2"///* 1201 "utf-16be" or "Unicodefffe" * 1252 "windows-1252"///* 65000 "utf-7", "Csunicode11utf7", "unicode-1-1-utf-7", "unicode-2-0-utf-7", "X-unicod" E-1-1-utf-7 "or" x-unicode-2-0-utf-7 "///* 65001" Utf-8 "," Unicode-1-1-utf-8 "," Unicode-2-0-utf-8 "," X-unicode-1-1-utf " -8 "or" X-unicode-2-0-utf-8 "///* 20127" Us-ascii ",""Us", "ASCII", "ansi_x3.4-1968", "ansi_x3.4-1986", "cp367", "Csascii", "IBM367", "iso-ir-6", "iso646-us" or "Iso_646.irv" : 1991 "///* 54936" GB18030 "///</param>///<param name=" code "> Strings to be encrypted </param& 
        Gt
        <returns> Encrypted string </returns> public static string EncodeBase64 (string code_type, String code)
            {String encode = ""; byte[] bytes = encoding.getencoding (code_type). GetBytes (code); 
            Encodes a set of characters into a sequence of bytes. 
            try {encode = convert.tobase64string (bytes);//Convert a subset of a 8-bit unsigned integer array to its equivalent, 64-based, numeric-encoded string form.
            catch {encode = code;
        return encode;
            public static string EncodeBase64 (string code) {String encode = ""; byte[] bytes = Encoding.Default.GetBytes (code); 
            Encodes a set of characters into a sequence of bytes. try {encode = Convert.tobase64String (bytes); 
            Converts a subset of a 8-bit unsigned integer array to its equivalent, 64-based, numeric-encoded string form.
            catch {encode = code;
        return encode; 
        }///<summary>///2013-11-05 New///decrypts a string using the Base64 algorithm///</summary> <param name= "Code_type" > Encoding type </param>///<param name= "code" > Strings that have been encrypted with the Base64 algorithm </param& 
        Gt
        <returns> decrypted string </returns> public static string DecodeBase64 (string code_type, String code)
            {String decode = ""; byte[] bytes = convert.frombase64string (code); 
            Converts the 2 feed encoding to an array of 8-bit unsigned integers. try {decode = encoding.getencoding (Code_type). GetString (bytes); 
            Decodes a sequence of bytes from the specified byte array into a string.
            catch {decode = code;
        return decode;
  public static string DecodeBase64 (String code)      {String decode = ""; byte[] bytes = convert.frombase64string (code); 
            Converts the 2 feed encoding to an array of 8-bit unsigned integers. 
            try {decode = Encoding.Default.GetString (bytes);//decodes a sequence of bytes from the specified byte array into a string.
            catch {decode = code;
        return decode;
 }
    }
}