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Change a Password in ASP.NET

Posted by Satyapriya Nayak Articles | ASP.NET Programming June 13, 2012
In this article you will see how to change a password of a registered user in ASP.NET.
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Introduction

The registered user needs to login with his/her login credentials (user name and password). After successful login a Change password link will be visible. Here by clicking the link a new page will appear where the user must enter the Current Password, New Password and Confirm Password and then click on the Update button to change his/her password respectively.

Table structure
password1.jpg
Now let's move to the coding part.

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Password_Change_in_asp.net._Default" %> 
<!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>Untitled Page</title>
</head>
<
body>
    <form id="form1" runat="server">
    <div>  
     <asp:Label ID="Label1" runat="server" Text="Name" Font-Bold="True"
            Width="100px" BackColor="#FFFF66" ForeColor="#FF3300"></asp:Label>
        <asp:TextBox ID="TextBox_user_name" runat="server" ForeColor="#993300" Width="100px"></asp:TextBox><br />
        <asp:Label ID="Label2" runat="server" Text="Password" Font-Bold="True"
            Width="100px" BackColor="#FFFF66" ForeColor="#FF3300"></asp:Label>
        <asp:TextBox ID="TextBox_password" runat="server" ForeColor="#CC6600"
            TextMode="Password" Width="100px"></asp:TextBox><br />
        <asp:Button ID="btn_login" runat="server" Text="Login" Font-Bold="True"
            BackColor="#CCFF99" onclick="btn_login_Click"  /><br />
             <asp:Label ID="lb1" runat="server" Font-Bold="True" ForeColor="#FF3300"></asp:Label>
    </div>   
    </form>
</body>
</
html>

Default.aspx.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

namespace
Password_Change_in_asp.net
{
    public partial class _Default : System.Web.UI.Page
    {
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string str = null;
        SqlCommand com;
        protected void btn_login_Click(object sender, EventArgs e)
        {
            object obj = null;
            SqlConnection con = new SqlConnection(strConnString);
            con.Open();

            Session["UserName"] = TextBox_user_name.Text;
            str = "select count(*) from login where UserName=@UserName and Password =@Password";
            com = new SqlCommand(str, con);
            com.CommandType = CommandType.Text;
            com.Parameters.AddWithValue("@UserName", Session["UserName"]);
            com.Parameters.AddWithValue("@Password", TextBox_password.Text);
            obj = com.ExecuteScalar();
            if ((int)(obj) != 0)
            {
                Response.Redirect("Welcome.aspx");
            }
            else
            {
                lb1.Text = "Invalid Username and Password";
            }
            con.Close();
        }
    }
}


Welcome.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Welcome.aspx.cs" Inherits="Password_Change_in_asp.net.Welcome" %> 
<!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>Untitled Page</title>
</head>
<
body>
    <form id="form1" runat="server">
    <div>
     <asp:Label ID="lb1" runat="server" Font-Bold="True" ForeColor="#FF3300"></asp:Label><br />
    </div>
    <asp:LinkButton ID="lnk_changepassword" runat="server"
        onclick="lnk_changepassword_Click">Change Password</asp:LinkButton>
    </form>
</body>
</
html>

Welcome.aspx.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
 
namespace Password_Change_in_asp.net
{
    public partial class Welcome : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            lb1.Text = "WELLCOME :: " + Session["UserName"];
        }
 
        protected void lnk_changepassword_Click(object sender, EventArgs e)
        {
            Response.Redirect("Changepassword.aspx");
        }
    }
}


Changepassword.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Changepassword.aspx.cs"
Inherits
="Password_Change_in_asp.net.Changepassword" %>
 
<!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>Untitled Page</title>
</head>
<
body>
    <form id="form1" runat="server">
    <div>
        <asp:Label ID="Label1" runat="server" Text="Current password" Width="120px"
            Font-Bold="True" ForeColor="#996633"></asp:Label>
        <asp:TextBox ID="txt_cpassword" runat="server" TextMode="Password"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
            ControlToValidate="txt_cpassword"
            ErrorMessage="Please enter Current password"></asp:RequiredFieldValidator>
        <br />
         <asp:Label ID="Label2" runat="server" Text="New password" Width="120px"
            Font-Bold="True" ForeColor="#996633"></asp:Label>
        <asp:TextBox ID="txt_npassword" runat="server" TextMode="Password"></asp:TextBox>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
            ControlToValidate="txt_npassword" ErrorMessage="Please enter New password"></asp:RequiredFieldValidator>
        <br />
       
         <asp:Label ID="Label3" runat="server" Text="Confirm password" Width="120px"
            Font-Bold="True" ForeColor="#996633"></asp:Label>

        <asp:TextBox ID="txt_ccpassword" runat="server" TextMode="Password"></asp:TextBox>   

        <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
            ControlToValidate="txt_ccpassword"
            ErrorMessage="Please enter Confirm  password"></asp:RequiredFieldValidator>

        <asp:CompareValidator ID="CompareValidator1" runat="server"
            ControlToCompare="txt_npassword" ControlToValidate="txt_ccpassword"
            ErrorMessage="Password Mismatch"></asp:CompareValidator>   
    </div>
    <asp:Button ID="btn_update" runat="server" Font-Bold="True" BackColor="#CCFF99" onclick="btn_update_Click" Text="Update" />
    <asp:Label ID="lbl_msg" Font-Bold="True" BackColor="#FFFF66" ForeColor="#FF3300" runat="server" Text=""></asp:Label><br />
    <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Default.aspx">Login</asp:HyperLink>
    </form>
</body>
</
html>

Changepassword.aspx.cs

using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;

namespace
Password_Change_in_asp.net
{
    public partial class Changepassword : System.Web.UI.Page
    {
        string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
        string str = null;
        SqlCommand com;
        byte up;
        protected void btn_update_Click(object sender, EventArgs e)
        {
            SqlConnection con = new SqlConnection(strConnString);
            con.Open();
            str = "select * from login ";
            com = new SqlCommand(str, con);
            SqlDataReader reader = com.ExecuteReader();
            while (reader.Read())
            {
                if (txt_cpassword.Text == reader["Password"].ToString())
                {
                    up = 1;
                }
            }
            reader.Close();
            con.Close();
            if (up == 1)
            {
                con.Open();
                str = "update login set Password=@Password where UserName='" + Session["UserName"].ToString()+ "'";
                com = new SqlCommand(str, con);
                com.Parameters.Add(new SqlParameter("@Password", SqlDbType.VarChar, 50));
                com.Parameters["@Password"].Value = txt_npassword.Text;
                com.ExecuteNonQuery();
                con.Close();
                lbl_msg.Text = "Password changed Successfully";
            }
            else
            {
                lbl_msg.Text = "Please enter correct Current password";
            }
        }
    }
}

Output

Providing credentials (user name and password) for login:

password2.jpg

After successful login:

password3.jpg

Changing the current password by providing a new password:

password4.jpg

Password changed successfully:

password5.jpg
Conclusion

So here we learned how to change a password in ASP.Net.

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