Question

is it possible that when i start a windows form application , it automatically picks up the username and password from the credential entered at the starting of the windows and login the user automatically.

Answer 1

Picking up password is never possible as it is a security threat.

Depending on the language your WinForms application is written in, there might be several methods to get the Username of the user currently logged in.

In C#, you can get it like this:

string username = Environment.UserName;
string domain = Environment.UserDomainName;
string fullyQualifiedUsername = domain + "\\" + username;

Once, you have the username, you can assume that the user is already authenticated as he is logged in to the machine.

Hence, you can then bypass ASP.NET Forms authentication by creating a custom page which “logs in” the user obtained above:

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;
using System.Activities.Statements;

public partial class sso : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        string username = Request["username"];
        FormsAuthentication.RedirectFromLoginPage(username, false);
    }
}

You can then call the page thus: http://localhost/sso/sso.aspx?username=Varun+Chatterji

DISCLAIMER: This is sample code and not meant for production. If you implement a “login” in this fashion using query string alone, you must secure the login by some form of authentication in sso.aspx