Encoding and Decoding

private string EncodeData(string sData) 
{ 
try 
{ 
byte[] toencodeData = new byte[sData.Length]; 
toencodeData = System.Text.Encoding.UTF8.GetBytes(sData); 
//encodes all the characters into a specified sequence of bytes 
string encodedData = Convert.ToBase64String(toencodeData); 
return encodedData; 
} 
catch (Exception ex) 
{ 
throw new Exception(Error in EncodeData + ex.Message); 
} 
} 
public string DecodeData(string sData) 
{ 
System.Text.UTF8Encoding utf8encoder = new System.Text.UTF8Encoding(); 
System.Text.Decoder utf8Decoder = utf8encoder.GetDecoder(); 
byte[] tobedecode_byte = Convert.FromBase64String(sData); 
//converts the specified System.String,which encode binary data as base 64 digits,to an equivalent 8-bit unsigned integer array
int char_Count = utf8Decoder.GetCharCount(tobedecode_byte, 0, tobedecode_byte.Length);
//calaculates the number of characters produced by decodeing a sequence of bytes from the specified byte array

char[] decoded_char = new char[char_Count]; 

utf8Decoder.GetChars(tobedecode_byte, 0, tobedecode_byte.Length, decoded_char, 0); 
//Decodes a sequence of bytes from the specified byte array and any butes in the internal buffer into the specified character array 
string resultstring = new String(decoded_char); 
return resultstring; 
}