In previous article I explained How to Send User Confirmation Email after Registration in ASP.NET by using C# Coding. Now i'm going to explain How to Encode and Decode Password in Asp.net Registration and Login Page using C# Programming.
These Articles will help you in coding how to use encoding and decoding class in programming.
Encode :
Encoding is used to convert password to random char (or) Meaningless char
For Example : Password : Tiger@123 | Encode : cHJhZGVlcEAxMjM=
Encode is used to convert password and stored into Database(Find Register Page Code Below)
Decode :
Decoding is exactly viceverse of Encoding.
For Example : Decode : cHJhZGVlcEAxMjM= | Password : Tiger@123
Decode is used to convert Encoded password from Database.(Find Login Page Code Below)
Create Database
USE [master] GO /****** Object: Table [dbo].[Registration] Script Date: 04/07/2015 11:31:15 ******/ SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO CREATE TABLE [dbo].[Registration]( [username] [nvarchar](50) NULL, [password] [nvarchar](50) NULL, [emailid] [nvarchar](50) NULL, [activation_code] [uniqueidentifier] NULL, [account_status] [nvarchar](15) NULL ) ON [PRIMARY] GO
HTML Markup : Create Registration Page
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Registration.aspx.cs" Inherits="Registration" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="table">
<tr>
<th class="table_th" colspan="2">Registration</th>
</tr>
<tr>
<td colspan="2"></td>
</tr>
<tr>
<td style="width:200px; text-align:center;">Username :</td>
<td><asp:TextBox ID="txtusername" runat="server" CssClass="txtbox"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
ControlToValidate="txtusername" >enter username</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td style="width:200px; text-align:center;">Password :</td>
<td><asp:TextBox ID="txtpassword" runat="server" CssClass="txtbox" TextMode="Password"></asp:TextBox>
<asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
ControlToValidate="txtpassword">enter password</asp:RequiredFieldValidator>
</td>
</tr>
<tr>
<td style="width:200px; text-align:center;">Email ID :</td>
<td><asp:TextBox ID="txtemailid" runat="server" CssClass="txtbox"></asp:TextBox><asp:RegularExpressionValidator
ID="RegularExpressionValidator1" runat="server"
ControlToValidate="txtemailid"
ValidationExpression="\w+undefined[-+.']\w+)*@\w+undefined[-.]\w+)*\.\w+undefined[-.]\w+)*">please enter valid email addressundefinedabc@xyz.com)</asp:RegularExpressionValidator></td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="Btn_Register" runat="server" Text="Register"
onclick="Btn_Register_Click"/>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
C# Coding
C# Coding : Namespace
Namespace for Encode & Decode :
using System.Text;
using System.Security.Cryptography;
Encode is used to convert password and stored into Database
- private string Encrypt_Password(string password)
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.UI; using System.Web.UI.WebControls; using System.Configuration; using System.Data; using System.Data.SqlClient; using System.Text; using System.Security.Cryptography;
C# Coding : Button Click Event
public partial class Registration : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["RCCon"].ConnectionString);
SqlCommand cmd;
protected void Btn_Register_Click(object sender, EventArgs e)
{
string encry_password = Encrypt_Password(txtpassword.Text);
cmd = new SqlCommand("insert into Registration values('" + txtusername.Text.ToLower() + "','" + encry_password + "','" + txtemailid.Text + "','" + activationCode + "','active')");
cmd.Connection = con;
con.Open();
cmd.ExecuteNonQuery();
con.Close();
Session["user"] = txtusername.Text;
Response.Redirect("Default.aspx?username="+txtusername.Text);
}
C# Coding : Encript Password Method
private string Encrypt_Password(string password)
{
string pwdstring = string.Empty;
byte[] pwd_encode = new byte[password.Length];
pwd_encode = Encoding.UTF8.GetBytes(password);
pwdstring = Convert.ToBase64String(pwd_encode);
return pwdstring;
}
}
HTMK Markup : Create Login Page
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="login.aspx.cs" Inherits="login" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<link href="StyleSheet.css" rel="stylesheet" type="text/css" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table class="table">
<tr>
<th colspan="2" class="table_th">Login Page</th>
</tr>
<tr >
<td>Username :</td>
<td><asp:TextBox ID="txtusername" runat='server' CssClass="txtbox"></asp:TextBox></td>
</tr>
<tr>
<td >Password :</td>
<td><asp:TextBox id="txtpassword" runat="server" CssClass="txtbox" TextMode="Password"></asp:TextBox></td>
</tr>
<tr>
<td colspan="2" align="center">
<asp:Button ID="Btn_Login" runat="server" onclick="Btn_Login_Click" Text="Login" />
</td>
</tr>
<tr>
<td colspan="2">
Create a New Account : <a href="Registration.aspx">SignUp</a>
</td>
</tr>
<tr>
<td colspan="2" align="left">
<label id="lblerror" runat="server"></label>
</td>
</tr>
</table>
</div>
</form>
</body>
</html>
C# Coding for Login Page
Decode is used to convert Encoded password from Database- private string Decrypt_Password(string encryptpassword)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Data;
using System.Configuration;
using System.Data.SqlClient;
using System.Text;
using System.IO;
public partial class login : System.Web.UI.Page
{
SqlConnection con = new SqlConnection(ConfigurationManager.ConnectionStrings["RCCon"].ConnectionString);
protected void Btn_Login_Click(object sender, EventArgs e)
{
SqlDataAdapter da = new SqlDataAdapter("select * from Registration", con);
DataSet ds = new DataSet();
da.Fill(ds);
if (ds.Tables[0].Rows.Count > 0)
{
for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
{
string userid = ds.Tables[0].Rows[i]["username"].ToString();
string pwd = Decrypt_Password(ds.Tables[0].Rows[i]["password"].ToString());
string status = "active";
if (status == ds.Tables[0].Rows[i]["account_status"].ToString())
{
if (userid == txtusername.Text.ToLower() && pwd == txtpassword.Text)
{
Response.Redirect("Default.aspx?Username=" + txtusername.Text);
}
}
lblerror.InnerText = "Invalid Username and Password";
}
}
}
private string Decrypt_Password(string encryptpassword)
{
string pwdstring = string.Empty;
UTF8Encoding encode_pwd = new UTF8Encoding();
Decoder Decode = encode_pwd.GetDecoder();
byte[] todecode_byte = Convert.FromBase64String(encryptpassword);
int charCount = Decode.GetCharCount(todecode_byte, 0, todecode_byte.Length);
char[] decoded_char = new char[charCount];
Decode.GetChars(todecode_byte, 0, todecode_byte.Length, decoded_char, 0);
pwdstring = new String(decoded_char);
return pwdstring;
}
}
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