How to Encryption decryption password

Method (1) :

NameSpaces : 
using System.Security.Cryptography;
using System.Text;
using System.IO;

HTML :

  <p>
        Current Guid :&nbsp;
        <asp:Label ID="lblGuid" runat="server" ></asp:Label>
    </p>
<p>
        User Password :
        <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
    </p>
<p>
        <asp:Button ID="btnEncryption" runat="server"
            Text="Encryption" onclick="btnEncryption_Click" />
        <asp:Button ID="btnDecryption" runat="server"
            Text="Decryption" onclick="btnDecryption_Click" />
    </p>
<p>
        Encrypting Password :
        <asp:Label ID="lblEncrypting" runat="server" ></asp:Label>
    </p>
<p>
        Decrypting Password :
        <asp:Label ID="lblDecrypting" runat="server" ></asp:Label>
    </p>


Code-Behind :

 protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            Guid passwordSalt = System.Guid.NewGuid();
            lblGuid.Text = passwordSalt.ToString();
        }
    }

    protected void btnEncryption_Click(object sender, EventArgs e)
    {
        lblEncrypting.Text = Encryption_decryption.Encrypt(TextBox1.Text, Convert.ToString(lblGuid.Text));
    }

    protected void btnDecryption_Click(object sender, EventArgs e)
    {
        lblDecrypting.Text = Encryption_decryption.Decrypt(TextBox1.Text, Convert.ToString(lblGuid.Text));
    }


Encryption-Decryption Class :

  public class Encryption_decryption
    {
        public static string Decrypt(string TextToBeDecrypted, string SaltContaint)
        {
            RijndaelManaged RijndaelCipher = new RijndaelManaged();

            //string SaltContaint = "CSC";
            string DecryptedData;

            try
            {
                byte[] EncryptedData = Convert.FromBase64String(TextToBeDecrypted);

                byte[] Salt = Encoding.ASCII.GetBytes(SaltContaint.Length.ToString());
                //Making of the key for decryption
                PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(SaltContaint, Salt);
                //Creates a symmetric Rijndael decryptor object.
                ICryptoTransform Decryptor = RijndaelCipher.CreateDecryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));

                MemoryStream memoryStream = new MemoryStream(EncryptedData);
                //Defines the cryptographics stream for decryption.THe stream contains decrpted data
                CryptoStream cryptoStream = new CryptoStream(memoryStream, Decryptor, CryptoStreamMode.Read);

                byte[] PlainText = new byte[EncryptedData.Length];
                int DecryptedCount = cryptoStream.Read(PlainText, 0, PlainText.Length);
                memoryStream.Close();
                cryptoStream.Close();

                //Converting to string
                DecryptedData = Encoding.Unicode.GetString(PlainText, 0, DecryptedCount);
            }
            catch
            {
                DecryptedData = TextToBeDecrypted;
            }
            return DecryptedData;
        }
       
        public static string Encrypt(string TextToBeEncrypted, string SaltContaint)
        {
            RijndaelManaged RijndaelCipher = new RijndaelManaged();
            //string SaltContaint = "CSC";
            byte[] PlainText = System.Text.Encoding.Unicode.GetBytes(TextToBeEncrypted);
            byte[] Salt = Encoding.ASCII.GetBytes(SaltContaint.Length.ToString());
            PasswordDeriveBytes SecretKey = new PasswordDeriveBytes(SaltContaint, Salt);
            //Creates a symmetric encryptor object.
            ICryptoTransform Encryptor = RijndaelCipher.CreateEncryptor(SecretKey.GetBytes(32), SecretKey.GetBytes(16));
            MemoryStream memoryStream = new MemoryStream();
            //Defines a stream that links data streams to cryptographic transformations
            CryptoStream cryptoStream = new CryptoStream(memoryStream, Encryptor, CryptoStreamMode.Write);
            cryptoStream.Write(PlainText, 0, PlainText.Length);
            //Writes the final state and clears the buffer
            cryptoStream.FlushFinalBlock();
            byte[] CipherBytes = memoryStream.ToArray();
            memoryStream.Close();
            cryptoStream.Close();
            string EncryptedData = Convert.ToBase64String(CipherBytes);

            return EncryptedData;
        }
    }

 
Method (2) :

HTML :

<table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td>
                <asp:TextBox ID="txtData" runat="server"></asp:TextBox>
            </td>
            <td>
                <asp:TextBox runat="server" ID="txtEncrypt"></asp:TextBox>
            </td>
            <td>
                <asp:TextBox runat="server" ID="txtDecrypt"></asp:TextBox>
            </td>
        </tr>
        <tr>
            <td>
                <asp:Button ID="btnEncrypt" runat="server" OnClick="btnEncrypt_Click" Text="Encrypt" />
                <asp:Button ID="btnDecrypt" runat="server" Text="Decrypt" OnClick="btnDecrypt_Click" />
            </td>
        </tr>
    </table>

Code-Behind :

 EncryptionManager manager = new EncryptionManager();
 protected void btnEncrypt_Click(object sender, EventArgs e)
        {
            txtEncrypt.Text = manager.Encrypt(txtData.Text);
        }
        protected void btnDecrypt_Click(object sender, EventArgs e)
        {
            txtDecrypt.Text = manager.Decrypt(txtEncrypt.Text);
        }


Encryption-Decryption Class : 

 public class EncryptionManager
        {
            private byte[] Key = { 89, 83, 45, 236, 140, 228, 180, 79, 209, 164, 231, 131, 28, 7, 110, 73, 140, 235, 118, 52, 225, 46, 202, 118 };
            private byte[] IV = { 161, 200, 187, 207, 22, 92, 119, 227 };
            public string Encrypt(string inputString)
            {
                //Step #4
                byte[] buffer = Encoding.ASCII.GetBytes(inputString);

                TripleDESCryptoServiceProvider tripleDes = new TripleDESCryptoServiceProvider()
                {
                    Key = Key,
                    IV = IV
                };
                //Step #4,5,6
                ICryptoTransform ITransform = tripleDes.CreateEncryptor();
                return Convert.ToBase64String(ITransform.TransformFinalBlock(buffer, 0, buffer.Length));
            }
            public string Decrypt(string inputString)
            {
                byte[] buffer = Convert.FromBase64String(inputString);
                TripleDESCryptoServiceProvider tripleDes = new TripleDESCryptoServiceProvider()
                {
                    Key = Key,
                    IV = IV
                };
                ICryptoTransform ITransform = tripleDes.CreateDecryptor();
                return Encoding.ASCII.GetString(ITransform.TransformFinalBlock(buffer, 0, buffer.Length));
            }
        }