How to get Facebook user data by asp.net?

How to get Facebook user data by asp.net?

How can I get the Facebook user details without click on login button as
the code below . as when user accept allow the app to display on his
Facebook page i can get all user Facebook details .
public partial class DefaultPage : System.Web.UI.Page
{
protected void Login(object sender, EventArgs e)
{
FaceBookConnect.Authorize("user_photos,email",
Request.Url.AbsoluteUri.Split('?')[0]);
}
protected void Page_Load(object sender, EventArgs e)
{
FaceBookConnect.API_Key = "111111111111111";
FaceBookConnect.API_Secret = "xxxxxxxxxxxxxxxxxx";
if (!IsPostBack)
{
if (Request.QueryString["error"] == "access_denied")
{
ClientScript.RegisterStartupScript(this.GetType(),
"alert", "alert('User has denied access.')", true);
return;
}
string code = Request.QueryString["code"];
if (!string.IsNullOrEmpty(code))
{
string data = FaceBookConnect.Fetch(code, "me");
FaceBookUser faceBookUser = new
JavaScriptSerializer().Deserialize<FaceBookUser>(data);
faceBookUser.PictureUrl =
string.Format("https://graph.facebook.com/{0}/picture",
faceBookUser.Id);
pnlFaceBookUser.Visible = true;
//lblId.Text = faceBookUser.Id;
//lblUserName.Text = faceBookUser.UserName;
lblName.Text = faceBookUser.Name;
//lblEmail.Text = faceBookUser.Email;
ProfileImage.ImageUrl = faceBookUser.PictureUrl;
//btnLogin.Enabled = false;
}
}
}
}
public class FaceBookUser
{
public string Id { get; set; }
public string Name { get; set; }
public string UserName { get; set; }
public string PictureUrl { get; set; }
public string Email { get; set; }
}