In this article i have explain how to login authentication using web.config file in asp.net c#.
for doing this add the following code in web.config file
<system.web>
<compilation debug="true" targetFramework="4.6"/>
<httpRuntime targetFramework="4.6"/>
<authentication mode="Forms">
<forms loginUrl="Login.aspx" defaultUrl="Welcome.aspx">
<credentials passwordFormat="Clear">
<user name="brij" password="brijhbti"/>
<user name="nisha" password="nisha"/>
</credentials>
</forms>
</authentication>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
Add Login.aspx web form and add the following code.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>User Name:</td>
<td><input type="text" id="txtUserName" runat="server" /> </td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" id="txtPassword" runat="server" /> </td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblError" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td><asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="btnLogin_Click" /></td>
<td><asp:Button ID="btnCancel" runat="server" Text="Cancel" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
for doing this add the following code in web.config file
<system.web>
<compilation debug="true" targetFramework="4.6"/>
<httpRuntime targetFramework="4.6"/>
<authentication mode="Forms">
<forms loginUrl="Login.aspx" defaultUrl="Welcome.aspx">
<credentials passwordFormat="Clear">
<user name="brij" password="brijhbti"/>
<user name="nisha" password="nisha"/>
</credentials>
</forms>
</authentication>
<authorization>
<deny users="?"/>
</authorization>
</system.web>
Add Login.aspx web form and add the following code.
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<table>
<tr>
<td>User Name:</td>
<td><input type="text" id="txtUserName" runat="server" /> </td>
</tr>
<tr>
<td>Password:</td>
<td><input type="password" id="txtPassword" runat="server" /> </td>
</tr>
<tr>
<td colspan="2">
<asp:Label ID="lblError" runat="server"></asp:Label>
</td>
</tr>
<tr>
<td><asp:Button ID="btnLogin" runat="server" Text="Login" OnClick="btnLogin_Click" /></td>
<td><asp:Button ID="btnCancel" runat="server" Text="Cancel" /></td>
</tr>
</table>
</div>
</form>
</body>
</html>
add the following c# code into Login.aspx.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.Security;
namespace authenticate
{
public partial class Login : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
}
protected void btnLogin_Click(object sender, EventArgs e)
{
if (FormsAuthentication.Authenticate(txtUserName.Value, txtPassword.Value))
{
//true=to create a durable cookie(once that is saved across browser session) otherwise false.
FormsAuthentication.RedirectFromLoginPage(txtUserName.Value,false);
}
else
{
lblError.Text = "Wrong User name or password !";
}
}
}
}
