Write an ASP.Net program to create a user control that receives the user name and password from the user and validates them. If the user name is ‘DYP’ and the password is ‘Pimpri’, then the user is authorized, otherwise not.

By Chaitrali / March 7, 2025

Answer:

Here’s an ASP.NET Web Forms application that includes:

A User Control (LoginControl.ascx) to accept a username and password.
A Web Form (Default.aspx) to use the control and display the validation result.

Steps to Implement

Create a Web Forms Application in Visual Studio.
Add a User Control (LoginControl.ascx).
Add a Web Form (Default.aspx).
Copy the following code into the respective files.

1. Create the User Control (`LoginControl.ascx`)

Right-click the project > Add > New Item > Web User Control > Name it LoginControl.ascx.

`LoginControl.ascx`

<%@ Control Language="VB" AutoEventWireup="true" CodeBehind="LoginControl.ascx.vb" Inherits="YourNamespace.LoginControl" %>

<table>
    <tr>
        <td>Username:</td>
        <td><asp:TextBox ID="txtUsername" runat="server"></asp:TextBox></td>
    </tr>
    <tr>
        <td>Password:</td>
        <td><asp:TextBox ID="txtPassword" runat="server" TextMode="Password"></asp:TextBox></td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="btnLogin_Click" />
        </td>
    </tr>
    <tr>
        <td colspan="2">
            <asp:Label ID="lblMessage" runat="server" ForeColor="Red"></asp:Label>
        </td>
    </tr>
</table>

2. Code-Behind for the User Control (`LoginControl.ascx.vb`)

Public Class LoginControl
    Inherits System.Web.UI.UserControl

    Public Event LoginSuccess()
    Public Event LoginFailed()

    Protected Sub btnLogin_Click(sender As Object, e As EventArgs)
        If txtUsername.Text = "DYP" And txtPassword.Text = "Pimpri" Then
            lblMessage.Text = "Login Successful!"
            lblMessage.ForeColor = System.Drawing.Color.Green
            RaiseEvent LoginSuccess()
        Else
            lblMessage.Text = "Invalid username or password."
            lblMessage.ForeColor = System.Drawing.Color.Red
            RaiseEvent LoginFailed()
        End If
    End Sub
End Class

3. Create the Web Form (`Default.aspx`)

Right-click the project > Add > New Web Form > Name it Default.aspx.

`Default.aspx`

<%@ Page Language="VB" AutoEventWireup="true" CodeBehind="Default.aspx.vb" Inherits="YourNamespace.Default" %>
<%@ Register Src="LoginControl.ascx" TagPrefix="uc" TagName="LoginControl" %>

<!DOCTYPE html>
<html lang="en">
<head runat="server">
    <title>Login Page</title>
</head>
<body>
    <form id="form1" runat="server">
        <uc:LoginControl ID="LoginControl1" runat="server" />
        <asp:Label ID="lblResult" runat="server" ForeColor="Blue"></asp:Label>
    </form>
</body>
</html>

4. Code-Behind for the Web Form (`Default.aspx.vb`)

InPublic Class Default
    Inherits System.Web.UI.Page

    Protected Sub Page_Load(sender As Object, e As EventArgs) Handles Me.Load
        AddHandler LoginControl1.LoginSuccess, AddressOf Login_Success
        AddHandler LoginControl1.LoginFailed, AddressOf Login_Failed
    End Sub

    Private Sub Login_Success()
        lblResult.Text = "Welcome! You are authorized."
    End Sub

    Private Sub Login_Failed()
        lblResult.Text = "Access Denied."
    End Sub
End Class