http 404 not found on loggin through login.aspx page directly

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C#

ASP.NET

i have tw0 pages

default.aspx and login.aspx.

on login page i enter username and password.. the problem is that when i directly debug the login.aspx page . error come http 404 not found

but when i debug ( run) default.aspx page and click on the login link( code for login link is below). which redirects the page to the login.aspx and after that when i enter username and password it works fine.. why login.aspx page is not working directly

i have login link on default.aspx page

i put the code in login link which is on default.aspx page and it redirect the page to login.aspx

protected void lnklogin_Click(object sender, EventArgs e)
    {
        FormsAuthentication.SignOut();
        Session.Abandon();

        // clear authentication cookie
        HttpCookie cookie1 = new HttpCookie(FormsAuthentication.FormsCookieName, "");
        cookie1.Expires = DateTime.Now.AddYears(-1);
        Response.Cookies.Add(cookie1);

        // clear session cookie (not necessary for your current problem but i would recommend you do it anyway)
        HttpCookie cookie2 = new HttpCookie("ASP.NET_SessionId", "");
        cookie2.Expires = DateTime.Now.AddYears(-1);
        Response.Cookies.Add(cookie2);

        FormsAuthentication.RedirectToLoginPage();
        
    }

it will redirect me to the login page...


on login page i have a code

 ecprops _user = new ecprops();
         dbcon dbo = new dbcon();
        _user = dbo.CheckUser(txtUserid.Text);
        if (_user != null)
        {
            if (_user.Password == txtPassword.Text)
            {
                FormsAuthenticationTicket Authticket = new FormsAuthenticationTicket(
                                                        1,
                                                        txtUserid.Text,
                                                        DateTime.Now,
                                                        DateTime.Now.AddMinutes(30),
                                                        chkRemeberMe.Checked,
                                                        _user.RoleName,
                                                        FormsAuthentication.FormsCookiePath);

                string hash = FormsAuthentication.Encrypt(Authticket);

                HttpCookie Authcookie = new HttpCookie(FormsAuthentication.FormsCookieName, hash);

                if (Authticket.IsPersistent) Authcookie.Expires = Authticket.Expiration;

                Response.Cookies.Add(Authcookie);

                string returnUrl = Request.QueryString["ReturnUrl"];
                if (returnUrl == null) returnUrl = "/";

                Response.Redirect(returnUrl);

                
            }
            else
            {
                lblMessage.Text = "Password does'nt match.";
            }
        }
        else
        {
            lblMessage.Text = "User not exists.";


i put the fallwoing in webconfig

<pre lang="HTML"><<pre>authentication mode="Forms">
        <forms loginUrl="login.aspx"
          name=".ASPXAUTH"
          protection="All"
               timeout="90" slidingExpiration="true"></forms>
      </authentication>
      <authorization>
        <allow users="*"/>
      </authorization

>
}

public ecprops CheckUser(string UserName)
        {
            MAconn = new SqlConnection(connectionString);
            const string SP_CHECKUSER = "CheckUser";
            MAconn.Open();
            MAcmd = new SqlCommand(SP_CHECKUSER, MAconn);
            MAcmd.CommandType = CommandType.StoredProcedure;
            MAcmd.Parameters.Add("@UserName", DbType.String).Value = UserName;
            dr = MAcmd.ExecuteReader();
           ecprops _user = null;
            while (dr.Read())
            {
                _user = new ecprops();
                _user.Password = dr["Password"].ToString();
                _user.RoleName = dr["RoleName"].ToString();
            }
            return _user;
        }