Code to encrypt the Password or any string

/// <summary>
/// This method retrieve the string to encrypt from the Presentation Layer
/// And return the Encrypted String
/// </summary>
/// <param name="str">
/// <returns>
public string encryptPassword(string strText)
{
    return Encrypt(strText, "&%#@?,:*");
}

/// <summary>
/// This method retrieve the encrypted string to decrypt from the Presentation Layer
/// And return the decrypted string
/// </summary>
/// <param name="str">
/// <returns>
public string decryptPassword(string str)
{
    return Decrypt(str, "&%#@?,:*");
}

/// <summary>
/// This method has been used to get the Encrypetd string for the
/// passed string
/// </summary>
/// <param name="strText">
/// <param name="strEncrypt">
/// <returns>
private string Encrypt(string strText, string strEncrypt)
{
    byte&#91;] byKey = new byte[20];
    byte&#91;] dv ={ 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
    try
    {
        byKey = System.Text.Encoding.UTF8.GetBytes(strEncrypt.Substring(0, 8));
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        byte&#91;] inputArray = System.Text.Encoding.UTF8.GetBytes(strText);
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateEncryptor(byKey, dv), CryptoStreamMode.Write);

        cs.Write(inputArray, 0, inputArray.Length);
        cs.FlushFinalBlock();

        return Convert.ToBase64String(ms.ToArray());
    }
    catch (Exception ex)
    {
        throw ex;
    }
}

/// <summary>
/// This method has been used to Decrypt the Encrypted String
/// </summary>
/// <param name="strText">
/// <param name="strEncrypt">
/// <returns>
private string Decrypt(string strText, string strEncrypt)
{
    byte&#91;] bKey = new byte[20];
    byte&#91;] IV = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };

    try
    {
        bKey = System.Text.Encoding.UTF8.GetBytes(strEncrypt.Substring(0, 8));
        DESCryptoServiceProvider des = new DESCryptoServiceProvider();
        Byte&#91;] inputByteArray = inputByteArray = Convert.FromBase64String(strText);
        MemoryStream ms = new MemoryStream();
        CryptoStream cs = new CryptoStream(ms, des.CreateDecryptor(bKey, IV), CryptoStreamMode.Write);

        cs.Write(inputByteArray, 0, inputByteArray.Length);
        cs.FlushFinalBlock();
        System.Text.Encoding encoding = System.Text.Encoding.UTF8;

        return encoding.GetString(ms.ToArray());
    }

    catch (Exception ex)
    {
        throw ex;
    }

}