How to Authenticate ASP.Net Web Application through Windows Authentication?

What is Authentication ?

        It is the process of identifying “who” the end-user is when they visit a website.

What is Authorization?

        It is the process of figuring out whether the authenticated user has permissions to access a particular page/resource or to perform some action.

How to Set Authentication & Authorization in Web.config?

    
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How to obtaining the Logged-in Username via Code?

    protected void Page_Load(object sender, EventArgs e)
    {
        lblUserName.Text = "Welcome : " + GetUserWithOutDomain();
        Session["UserID"] = GetUserWithOutDomain();
    }

    private String GetUserWithOutDomain()
    {
        if (HttpContext.Current.User.Identity.Name.IndexOf("\\") > 0)
        {
            return HttpContext.Current.User.Identity.Name.Substring(User.Identity.Name.IndexOf("\\") + 1);
        }
        else
            return User.Identity.Name;
    }

If a user not logged in via "Home" page redirect to Home.

    protected void Page_Load(object sender, EventArgs e)
    {
        if(Session["UserID"] == null || Convert.ToString(Session["UserID"]) == String.Empty)
        {
            Response.Redirect("Home.aspx");
        }
    }
 

How to deploy in IIS ?

1. Open the IIS manager ( Start -> Run -> "inetmgr")



2. Right click "Web sites" select "New -> web site".



3. Click the "next" button in the web site creation wizard.



4. Enter the description in Description Box.



5. Set the TCP port and click next button .

6. Map the web site path and uncheck the "anonymous access"



7. Select the necessary permission for the site.



8. Click Next & Finished button

9. Browse the newly created page.



In this way we can avoid the user login page in Intranet ASP.net web applications.