Login With Encoded Password | asp.net with c# (Password Encoding par...

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Login page .aspx (Design Code) : 



 <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="LoginEnc.aspx.cs" Inherits="test3.password_encrypt.LoginEnc" %>



<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">

<head runat="server">
    <title></title>
    <style type="text/css">
        .auto-style1
        {
            width: 100%;
        }
        .auto-style2
        {
            text-align: right;
        }
        .auto-style3
        {
            text-align: left;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
 
   <table class="auto-style1">
            <tr>
                <td class="auto-style2">
                    <asp:Label ID="Label1" runat="server" Text="Username : "></asp:Label>
                </td>
                <td class="auto-style3">
                    <asp:TextBox ID="UsernameTXT" runat="server" Width="230px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td class="auto-style2">
                    <asp:Label ID="Label2" runat="server" Text="Password : "></asp:Label>
                </td>
                <td class="auto-style3">
                    <asp:TextBox ID="PasswordTXT" runat="server" Width="230px"></asp:TextBox>
                </td>
            </tr>
            <tr>
                <td class="auto-style2">
                    <asp:Label ID="lblmsg" runat="server"></asp:Label>
                </td>
                <td class="auto-style3">
                    <asp:Button ID="LoginBTN" runat="server" Font-Bold="True" Font-Size="Medium" OnClick="LoginBTN_Click" Text="Login" />
                </td>
            </tr>
        </table>
 
    </div>
    </form>
</body>
</html>



Login Page .aspx.cs code (Code behind) : 


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data.SqlClient;
using System.Configuration;
using System.Text;
using System.Security.Cryptography;

namespace test3.password_encrypt
{
    public partial class LoginEnc : System.Web.UI.Page
    {

        SqlConnection conn = new SqlConnection();
        SqlCommand cmd = new SqlCommand();

        static string Encrypt(string value)//for encryption of text
        {
            using (MD5CryptoServiceProvider md5 = new MD5CryptoServiceProvider())
            {
                UTF8Encoding utf8 = new UTF8Encoding();
                byte[] data = md5.ComputeHash(utf8.GetBytes(value));
                return Convert.ToBase64String(data);
            }
        }
        protected void Page_Load(object sender, EventArgs e)
        {
            conn.ConnectionString = ConfigurationManager.ConnectionStrings["ConStr1"].ConnectionString;
            conn.Open();
        }

        protected void LoginBTN_Click(object sender, EventArgs e)
        {
            string passstr = Encrypt(PasswordTXT.Text);//for encrypting the inputed text in password textbox

            /*for loging in with comparing the encrypted password*/
            SqlDataReader reader;
            cmd.Connection = conn;
            cmd.CommandText = string.Format("select * from PassEnc where Username='{0}' and Password='{1}'", UsernameTXT.Text, passstr);

            reader = cmd.ExecuteReader();
            if (reader.Read())
            {
                Session["Username"] = UsernameTXT.Text;//for creating session
                string valueFromSession = Session["Username"].ToString();//for creating session
                conn.Close();

                Response.Redirect("~/password encrypt/LoginHomePg.aspx");
            }
            else
            {
                lblmsg.Text = "Username Or Password Invalid.";
                conn.Close();
            }
            /*-----------------------------------------------------*/
        }
    }
}



Home Page after Login .aspx (Design Code) : 



<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="LoginHomePg.aspx.cs" Inherits="test3.password_encrypt.LoginHomePg" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Logout" />
        <br />

    </div>
        <asp:Label ID="lblmsg" runat="server"></asp:Label>
    </form>
</body>
</html>


Home Page after Login .aspx.cs code (Code behind) : 


using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace test3.password_encrypt
{
    public partial class LoginHomePg : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (HttpContext.Current.Session["Username"] == null)//if session is not present it will redirect to login page
            {
                Response.Redirect("~/password encrypt/SaveEnc.aspx");
            }
            else//if session is present then it will display the welcome mesage
            {
                lblmsg.Text = "Welcome " + (string)(Session["Username"]) + " you have loged-in successfully";
            }

        }

        protected void Button1_Click(object sender, EventArgs e)
        {
            Session.Clear();
            Session.Abandon();
            Response.Redirect("~/password encrypt/SaveEnc.aspx", true);
        }
    }
}


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