public class CrypterText
{
    static byte[] chiperbytes;
    static byte[] plainbytes;
    static byte[] plainKey;
    static SymmetricAlgorithm desObj;
    public static string encryptData(string ciperData)
    {

        desObj = Rijndael.Create();

        plainbytes = Encoding.ASCII.GetBytes(ciperData);
        plainKey = Encoding.ASCII.GetBytes("0123456789abcdef");
        desObj.Key = plainKey;
        desObj.Mode = CipherMode.CBC;
        desObj.Padding = PaddingMode.ISO10126;
        System.IO.MemoryStream ms = new System.IO.MemoryStream();
        CryptoStream cs = new CryptoStream(ms, desObj.CreateEncryptor(), CryptoStreamMode.Write);
        cs.Write(plainbytes, 0, plainbytes.Length);
        cs.Close();
        chiperbytes = ms.ToArray();
        ms.Close();
        return Encoding.ASCII.GetString(chiperbytes);

    }

    public static string decrypt() {
        MemoryStream ms = new MemoryStream(chiperbytes);
        CryptoStream cs = new CryptoStream(ms, desObj.CreateDecryptor(), CryptoStreamMode.Read);
        cs.Read(chiperbytes, 0, chiperbytes.Length);
        plainbytes = ms.ToArray();
        cs.Close();
        ms.Close();
        return Encoding.ASCII.GetString(plainbytes);
    }