Encryption and decryption of password in ASP.NET C#

 ASPX CODE

<%@ Page Title="" Language="C#" MasterPageFile="~/Common.master" AutoEventWireup="true" CodeFile="DecryptPassword.aspx.cs" Inherits="DecryptPassword" %>

<asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">

        

</asp:Content>

<asp:Content ID="Content2" ContentPlaceHolderID="ContentPlaceHolder1" Runat="Server">

    <asp:TextBox runat="server" ID="txtPassword" Width="200px"/>

    <asp:Button runat="server" ID="btnGenerate" OnClick="btnGenerate_Click" Text="generate"/>

    <br />

    <asp:Label runat="server" ID="lblDecryptwithkey" Text="Decypt with Key" />

    <asp:TextBox runat="server" ID="txtDecryptWithKey" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnDecryptWithKey" OnClick="btnDecryptWithKey_Click" Text="Decrypt with key"/>

    <br />

    <asp:Label runat="server" ID="lblencryptwithkey" Text="Encrypt with Key" />

    <asp:TextBox runat="server" ID="txtEncryptWithKey" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnEncryptWithKey" OnClick="btnEncryptWithKey_Click" Text="Encrypt with key"/>

    <br />

    <asp:Label runat="server" ID="lblEncrypt" Text="Encrypt" />

    <asp:TextBox runat="server" ID="txtEncrypt" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnEncrypt" OnClick="btnEncrypt_Click" Text="Encrypt"/>

    <br />

    <asp:Label runat="server" ID="lblDecrypt" Text="Decrypt" />

    <asp:TextBox runat="server" ID="txtDecrypt" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnDecrypt" OnClick="btnDecrypt_Click1" Text="Decrypt"/>

    <br />

    <asp:Label runat="server" ID="lblDecode" Text="Decode" />

    <asp:TextBox runat="server" ID="txtDecode" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnDecode" OnClick="btnDecode_Click" Text="Decode"/>

    <br />

    <asp:Label runat="server" ID="lblEncode" Text="Encode" />

    <asp:TextBox runat="server" ID="txtEncode" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnEncode" OnClick="btnEncode_Click" Text="Encode"/>

    <br />

    <asp:Label runat="server" ID="lblMD5Encrypt" Text="MD5 Encrypt" />

    <asp:TextBox runat="server" ID="txtMD5Encrypt" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnMD5Encrypt" OnClick="btnMD5Encrypt_Click" Text="Encode"/>

    <br />

    <asp:Label runat="server" ID="lblMD5Decrypt" Text="MD5 Decrypt" />

    <asp:TextBox runat="server" ID="txtMD5Decrypt" Width="500px" Text="test" />

    <asp:Button runat="server" ID="btnMD5Decrypt" OnClick="btnMD5Decrypt_Click" Text="Decode"/>

</asp:Content>

ASPX.CS code

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Security.Cryptography;

using System.Text;

using System.Web;

using System.Web.Security;

using System.Web.UI;

using System.Web.UI.WebControls;

public partial class DecryptPassword : System.Web.UI.Page

{

    protected void Page_Load(object sender, EventArgs e)

    {

        

    }

    protected void btnDecrypt_Click(object sender, EventArgs e)

    {

        //txtDecrypt.Text = LuminousSecurity.Encryption.Encrypt(txtPassword.Text);

        //txtDecrypt.Text = System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, "md5");

        

        

        //txtDecrypt.Text= LuminiousUtility.Util.Utility.DecodePassword(txtPassword.Text);

    }

    protected void btnDecryptWithKey_Click(object sender, EventArgs e)

    {

        txtDecryptWithKey.Text = LuminousSecurity.Encryption.DecryptString(txtPassword.Text.Trim(), "lumbibthabik");

    }

    

    protected void btnDecode_Click(object sender, EventArgs e)

    {

        txtDecode.Text = LuminiousUtility.Util.Utility.DecodePassword(txtPassword.Text);

    }

    protected void btnEncrypt_Click(object sender, EventArgs e)

    {

        txtEncrypt.Text = LuminousSecurity.Encryption.Encrypt(txtPassword.Text);

    }

    protected void btnDecrypt_Click1(object sender, EventArgs e)

    {

        txtDecrypt.Text = LuminousSecurity.Encryption.Decrypt(txtPassword.Text);

    }

    protected void btnGenerate_Click(object sender, EventArgs e)

    {

    }

    protected void btnEncryptWithKey_Click(object sender, EventArgs e)

    {

        txtEncryptWithKey.Text = LuminousSecurity.Encryption.EncryptData(txtPassword.Text.Trim(), "lumbibthabik");

    }

    protected void btnEncode_Click(object sender, EventArgs e)

    {

        txtEncode.Text = LuminiousUtility.Util.Utility.EncodePassword(txtPassword.Text);

    }

    protected void btnMD5Encrypt_Click(object sender, EventArgs e)

    {

        txtMD5Encrypt.Text =  System.Web.Security.FormsAuthentication.HashPasswordForStoringInConfigFile(txtPassword.Text, "MD5").ToString();

    }

    protected void btnMD5Decrypt_Click(object sender, EventArgs e)

    {

        var authCookie = txtPassword.Text;

        HttpCookie cookie = new HttpCookie("pwd");

        cookie.Values.Add("", txtPassword.Text);

        if (authCookie == null) return;

        var cookieValue = cookie.Value;

        if (String.IsNullOrWhiteSpace(cookieValue)) return;

        var ticket = FormsAuthentication.Decrypt("4e30e7e5cb14a6e482a3b01184251045");

        txtMD5Decrypt.Text = ticket.ToString();

    }

}