Encryption and Decryption For a String

For Decrypt ============== byte[] encData_byte = new byte[string.Length]; encData_byte = System.Text.Encoding.UTF8.GetBytes(Textbox3.Text); string encodedData = Convert.ToBase64String(encData_byte); result= encodedData; for Encrypt: ==================== System.Text.UTF8Encoding encoder = new System.Text.UTF8Encoding(); System.Text.Decoder utf8Decode = encoder.GetDecoder(); byte[] todecode_byte = Convert.FromBase64String(string); int charCount = utf8Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length); char[] decoded_char = new char[charCount]; utf8Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0); string result = new String(decoded_char);