ASP.NET 3.5 Login Control in VB.NET

In this article, I am going to discuss how to use ASP.NET 3.5 Login control in VB.NET step by step.
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The ASP.NET login controls provide a robust login solution for ASP.NET Web applications without requiring programming. By default, login controls integrate with ASP.NET membership and forms authentication to help automate user authentication for a Web site. It provides you with a ready-to-use user interface that queries the user name and password from the user and offers a Log In button for login. It validate user credentials against the membership API and encapsulating the basic form authentication functionality like redirecting back to the original requested page in a restricted area of you application after the successful login.

The Login control displays a user interface for user authentication. The Login control contains text boxes for the user name and password and a check box that allows users to indicate whether they want the server to store their identity using ASP.NET membership and automatically be authenticated the next time they visit the site.

The Login control has properties for customized display, for customized messages, and for links to other pages where users can change their password or recover a forgotten password. The Login control can be used as a standalone control on a main or home page, or you can use it on a dedicated login page. If you use the Login control with ASP.NET membership, you do not need to write code to perform authentication. However, if you want to create your own authentication logic, you can handle the Login control's Authenticate event and add custom authentication code.

Note - Login controls might not function correctly if the Method of the ASP.NET Web page is changed from POST (the default) to GET.

  • Start Microsoft Visual Studio 2008
     
  • Create a new ASP.NET Website using Visual Basic, Like this:

    Image6.jpg
     
  • Drag and drop Login control on page from ToolBox.

    Image7.jpg

    Image1.jpg


Whenever user hits the Log In button, the control automatically validates the user name and password using the membership API function Membership.ValidateUse() and then calls FormAuthentication.redirectFromLoginPage() if the validation was successful. All options on the UI of the LoginControl affect the input delivered by the control to these methods. For Example, if you click the "Remember me next time" check box, it passes the value true to the createPresistentCookie parameter of the RedirectFromLoginPage() method. Therefore, the FormAuthenticateModule creates a persistent cookie.

There are three Login Tasks by default.

  • Auto Format - you can select default schemes.
  • Convert To Template - You can edit content of Login Control.
  • Administer Website -  You can configure Web Site Administration Tools, Like Security, Application, Provider.

Image2.jpg
 

<form id="form1" runat="server">

<div>

<asp:Login ID="Login1" runat="server" BackColor="#F7F7DE" BorderColor="#CCCC99" BorderStyle="Solid" BorderWidth="1px" Font-Names="Verdana" Font-Size="10pt">

<TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="#FFFFFF" />

</asp:Login>

    </div>

    </form>

 You can change styles of LoginControl using css too,  Like this.

 

.LoginControl

{

          background-color:#F7F7DE;

          border-color:#CCCC99;

          border-style:solid;

    border-width:1px;

    font-family:Verdana;

    font-size:10px;    

}

And now apply css to control

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

<head runat="server">

    <title>Login Control</title>

    <link href="StyleSheet.css" type="text/css" rel="Stylesheet" />

</head>

<body>

    <form id="form1" runat="server">

    <div>

        <asp:Login ID="Login1" runat="server" CssClass="LoginControl">

            <TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="#FFFFFF" />

        </asp:Login>

    </div>

    </form>

</body>

</html>

If you running the page and if the CSS file is placed in a directory where anonymous access is denied, the add the following configuration for the CSS file to you web.config file. 

<location path="StyleSheet.css">

<system.web>

<authorization>

<allow users="*"/>

</authorization>

</system.web>

</location> 

You can add several hyperlinks to your Login control, such as hyperlink to a help text page, or a hyperlink to to a registration page.

<asp:Login ID="Login1" runat="server" CssClass="LoginControl"

CreateUserText="Register"

CreateUserUrl="~/Register.aspx"

HelpPageText="Additional Help" HelpPageUrl="~/Help.aspx"

InstructionText="Please enter your user name and password for login.">

<TitleTextStyle BackColor="#6B696B" Font-Bold="True" ForeColor="#FFFFFF" />

</asp:Login>

Looks like this.

Image3.jpg

Here is .VB Code:

Imports System

Imports System.Collections.Generic

Imports System.Linq

Imports System.Web

Imports System.Web.UI

Imports System.Web.UI.WebControls

Imports System.Data.SqlClient

 

Partial Class _Default

    Inherits System.Web.UI.Page

 

    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

        If Not Me.IsPostBack Then

            ViewState("LoginErrors") = 0

        End If

    End Sub

 

    Protected Sub Login1_Authenticate(ByVal sender As Object, ByVal e As AuthenticateEventArgs)

        If YourValidationFunction(Login1.UserName, Login1.Password) Then

            ' e.Authenticated = true;

            Login1.Visible = False

            MessageLabel.Text = "Successfully Logged In"

        Else

            e.Authenticated = False

        End If

    End Sub

 

    Protected Sub Login1_LoginError(ByVal sender As Object, ByVal e As EventArgs)

        If ViewState("LoginErrors") Is Nothing Then

            ViewState("LoginErrors") = 0

        End If

 

        Dim ErrorCount As Integer = CInt(ViewState("LoginErrors")) + 1

        ViewState("LoginErrors") = ErrorCount

 

        If (ErrorCount > 3) AndAlso (Login1.PasswordRecoveryUrl <> String.Empty) Then

            Response.Redirect(Login1.PasswordRecoveryUrl)

        End If

    End Sub

 

    Private Function YourValidationFunction(ByVal UserName As String, ByVal Password As String) As Boolean

        Dim boolReturnValue As Boolean = False

        Dim strConnection As String = "server=.;database=Vendor;uid=sa;pwd=wintellect;"

        Dim sqlConnection As New SqlConnection(strConnection)

        Dim SQLQuery As String = "SELECT UserName, Password FROM Login"

        Dim command As New SqlCommand(SQLQuery, sqlConnection)

        Dim Dr As SqlDataReader

        sqlConnection.Open()

        Dr = command.ExecuteReader()

        While Dr.Read()

            If (UserName = Dr("UserName").ToString()) And (Password = Dr("Password").ToString()) Then

                boolReturnValue = True

            End If

            Dr.Close()

            Return boolReturnValue

        End While

        Return boolReturnValue

    End Function

End Class

If you insert wrong username and password then message will show like this:

Image4.jpg

If you insert correct username, password then redirect your page wherever you want or you can show message in Error Label like this:

Image5.jpg
I am attaching my database with application in App_Data folder, if u want to use my database then attach my .MDF file.

Any question and queries ask me any time.

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