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

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Password_Change_in_asp.net._Default" %>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html xmlns="http://www.w3.org/1999/xhtml" >
  4. <head runat="server">
  5. <title>Untitled Page</title>
  6. </head>
  7. <body>
  8. <form id="form1" runat="server">
  9. <div>
  10. <asp:Label ID="Label1" runat="server" Text="Name" Font-Bold="True"
  11. Width="100px" BackColor="#FFFF66" ForeColor="#FF3300"></asp:Label>
  12. <asp:TextBox ID="TextBox_user_name" runat="server" ForeColor="#993300" Width="100px"></asp:TextBox><br />
  13. <asp:Label ID="Label2" runat="server" Text="Password" Font-Bold="True"
  14. Width="100px" BackColor="#FFFF66" ForeColor="#FF3300"></asp:Label>
  15. <asp:TextBox ID="TextBox_password" runat="server" ForeColor="#CC6600"
  16. TextMode="Password" Width="100px"></asp:TextBox><br />
  17. <asp:Button ID="btn_login" runat="server" Text="Login" Font-Bold="True"
  18. BackColor="#CCFF99" onclick="btn_login_Click" /><br />
  19. <asp:Label ID="lb1" runat="server" Font-Bold="True" ForeColor="#FF3300"></asp:Label>
  20. </div>
  21. </form>
  22. </body>
  23. </html>

Default.aspx.cs

  1. using System;
  2. using System.Collections;
  3. using System.Configuration;
  4. using System.Data;
  5. using System.Linq;
  6. using System.Web;
  7. using System.Web.Security;
  8. using System.Web.UI;
  9. using System.Web.UI.HtmlControls;
  10. using System.Web.UI.WebControls;
  11. using System.Web.UI.WebControls.WebParts;
  12. using System.Xml.Linq;
  13. using System.Data.SqlClient;
  15. namespace Password_Change_in_asp.net
  16. {
  17. public partial class _Default : System.Web.UI.Page
  18. {
  19. string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
  20. string str = null;
  21. SqlCommand com;
  22. protected void btn_login_Click(object sender, EventArgs e)
  23. {
  24. object obj = null;
  25. SqlConnection con = new SqlConnection(strConnString);
  26. con.Open();
  28. Session["UserName"] = TextBox_user_name.Text;
  29. str = "select count(*) from login where UserName=@UserName and Password =@Password";
  30. com = new SqlCommand(str, con);
  31. com.CommandType = CommandType.Text;
  32. com.Parameters.AddWithValue("@UserName", Session["UserName"]);
  33. com.Parameters.AddWithValue("@Password", TextBox_password.Text);
  34. obj = com.ExecuteScalar();
  35. if ((int)(obj) != 0)
  36. {
  37. Response.Redirect("Welcome.aspx");
  38. }
  39. else
  40. {
  41. lb1.Text = "Invalid Username and Password";
  42. }
  43. con.Close();
  44. }
  45. }
  46. }
Welcome.aspx

  1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Welcome.aspx.cs" Inherits="Password_Change_in_asp.net.Welcome" %>
  2. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  3. <html xmlns="http://www.w3.org/1999/xhtml" >
  4. <head runat="server">
  5. <title>Untitled Page</title>
  6. </head>
  7. <body>
  8. <form id="form1" runat="server">
  9. <div>
  10. <asp:Label ID="lb1" runat="server" Font-Bold="True" ForeColor="#FF3300"></asp:Label><br />
  11. </div>
  12. <asp:LinkButton ID="lnk_changepassword" runat="server"
  13. onclick="lnk_changepassword_Click">Change Password</asp:LinkButton>
  14. </form>
  15. </body>
  16. </html>
Welcome.aspx.cs
  1. using System;
  2. using System.Collections;
  3. using System.Configuration;
  4. using System.Data;
  5. using System.Linq;
  6. using System.Web;
  7. using System.Web.Security;
  8. using System.Web.UI;
  9. using System.Web.UI.HtmlControls;
  10. using System.Web.UI.WebControls;
  11. using System.Web.UI.WebControls.WebParts;
  12. using System.Xml.Linq;
  14. namespace Password_Change_in_asp.net
  15. {
  16. public partial class Welcome : System.Web.UI.Page
  17. {
  18. protected void Page_Load(object sender, EventArgs e)
  19. {
  20. lb1.Text = "WELLCOME :: " + Session["UserName"];
  21. }
  23. protected void lnk_changepassword_Click(object sender, EventArgs e)
  24. {
  25. Response.Redirect("Changepassword.aspx");
  26. }
  27. }
  28. }
Changepassword.aspx
  1. <%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Changepassword.aspx.cs"
  2. Inherits="Password_Change_in_asp.net.Changepassword" %>
  3. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  4. <html xmlns="http://www.w3.org/1999/xhtml" >
  5. <head runat="server">
  6. <title>Untitled Page</title>
  7. </head>
  8. <body>
  9. <form id="form1" runat="server">
  10. <div>
  11. <asp:Label ID="Label1" runat="server" Text="Current password" Width="120px"
  12. Font-Bold="True" ForeColor="#996633"></asp:Label>
  13. <asp:TextBox ID="txt_cpassword" runat="server" TextMode="Password"></asp:TextBox>
  14. <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server"
  15. ControlToValidate="txt_cpassword"
  16. ErrorMessage="Please enter Current password"></asp:RequiredFieldValidator>
  17. <br />
  18. <asp:Label ID="Label2" runat="server" Text="New password" Width="120px"
  19. Font-Bold="True" ForeColor="#996633"></asp:Label>
  20. <asp:TextBox ID="txt_npassword" runat="server" TextMode="Password"></asp:TextBox>
  21. <asp:RequiredFieldValidator ID="RequiredFieldValidator2" runat="server"
  22. ControlToValidate="txt_npassword" ErrorMessage="Please enter New password"></asp:RequiredFieldValidator>
  23. <br />
  25. <asp:Label ID="Label3" runat="server" Text="Confirm password" Width="120px"
  26. Font-Bold="True" ForeColor="#996633"></asp:Label>
  28. <asp:TextBox ID="txt_ccpassword" runat="server" TextMode="Password"></asp:TextBox>
  30. <asp:RequiredFieldValidator ID="RequiredFieldValidator3" runat="server"
  31. ControlToValidate="txt_ccpassword"
  32. ErrorMessage="Please enter Confirm password"></asp:RequiredFieldValidator>
  34. <asp:CompareValidator ID="CompareValidator1" runat="server"
  35. ControlToCompare="txt_npassword" ControlToValidate="txt_ccpassword"
  36. ErrorMessage="Password Mismatch"></asp:CompareValidator>
  37. </div>
  38. <asp:Button ID="btn_update" runat="server" Font-Bold="True" BackColor="#CCFF99" onclick="btn_update_Click" Text="Update" />
  39. <asp:Label ID="lbl_msg" Font-Bold="True" BackColor="#FFFF66" ForeColor="#FF3300" runat="server" Text=""></asp:Label><br />
  40. <asp:HyperLink ID="HyperLink1" runat="server" NavigateUrl="~/Default.aspx">Login</asp:HyperLink>
  41. </form>
  42. </body>
  43. </html>
Changepassword.aspx.cs

  1. using System;
  2. using System.Collections;
  3. using System.Configuration;
  4. using System.Data;
  5. using System.Linq;
  6. using System.Web;
  7. using System.Web.Security;
  8. using System.Web.UI;
  9. using System.Web.UI.HtmlControls;
  10. using System.Web.UI.WebControls;
  11. using System.Web.UI.WebControls.WebParts;
  12. using System.Xml.Linq;
  13. using System.Data.SqlClient;
  15. namespace Password_Change_in_asp.net
  16. {
  17. public partial class Changepassword : System.Web.UI.Page
  18. {
  19. string strConnString = ConfigurationManager.ConnectionStrings["ConnectionString"].ConnectionString;
  20. string str = null;
  21. SqlCommand com;
  22. byte up;
  23. protected void btn_update_Click(object sender, EventArgs e)
  24. {
  25. SqlConnection con = new SqlConnection(strConnString);
  26. con.Open();
  27. str = "select * from login ";
  28. com = new SqlCommand(str, con);
  29. SqlDataReader reader = com.ExecuteReader();
  30. while (reader.Read())
  31. {
  32. if (txt_cpassword.Text == reader["Password"].ToString())
  33. {
  34. up = 1;
  35. }
  36. }
  37. reader.Close();
  38. con.Close();
  39. if (up == 1)
  40. {
  41. con.Open();
  42. str = "update login set Password=@Password where UserName='" + Session["UserName"].ToString()+ "'";
  43. com = new SqlCommand(str, con);
  44. com.Parameters.Add(new SqlParameter("@Password", SqlDbType.VarChar, 50));
  45. com.Parameters["@Password"].Value = txt_npassword.Text;
  46. com.ExecuteNonQuery();
  47. con.Close();
  48. lbl_msg.Text = "Password changed Successfully";
  49. }
  50. else
  51. {
  52. lbl_msg.Text = "Please enter correct Current password";
  53. }
  54. }
  55. }
  56. }
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.