1		public string Base64Encode(string data)
2		{
3			byte[] encData_byte = new byte[data.Length];
4			encData_byte = System.Text.Encoding.UTF8.GetBytes(data);    
5			string encodedData = Convert.ToBase64String(encData_byte);
6			return encodedData;
7		}
8
9		
10		public string Base64Decode(string data)
11		{
12			System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding();  
13			System.Text.Decoder utf8Decode = encoder.GetDecoder();
14
15			byte[] todecode_byte = Convert.FromBase64String(data);
16			int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);    
17			char[] decoded_char = new char[charCount];
18			utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);                   
19			string result = new String(decoded_char);
20			return result;
21
22		}