Display text if Session is empty

Hello Experts,

I'm creating an application and I need help with hiding a Label Control if a particular Session variable does not exist or is empty. When a user logs into my system it stores there First, Last names, and EmpID which is there empoyee ID.

If a user signs in then I have there name displayed to a Label Control with a LinkButton allowing them to log out.

However, I need to display "Hello, Guest" if a user has not logged in and I then need to also disable or hide the LinkButton control.

Below is my current Page_Load code that displays the usersname First, Last names and EmpID to a Label Control if they have logged in.


Page_Load CodeBehind:

    protected void Page_Load(object sender, EventArgs e)
    {
        EmployeeLoginInfo();

        string FirstName = Convert.ToString(Session["fname"]);
        string LastName = Convert.ToString(Session["lname"]);
        string EmpID = Convert.ToString(Session["empid"]);


        lblFullNameSession.Text = "Hello, " + FirstName + " " + LastName;
    }


protected void EmployeeLoginInfo()
    {
        string emp_username = HttpContext.Current.User.Identity.Name;

        SqlConnection conn = new SqlConnection(ConfigurationManager.ConnectionStrings["WellnessTracker"].ConnectionString);

        SqlCommand cmd = new SqlCommand();
        cmd.CommandText = "RetrieveEmployeeLoginInfo";
        cmd.CommandType = CommandType.StoredProcedure;
        cmd.Connection = conn;

        cmd.Parameters.Add("@emp_username", SqlDbType.VarChar, 50).Value = emp_username;

        DataTable dtEmployeeInfo = new DataTable();
        SqlDataAdapter adp = new SqlDataAdapter();

        try
        {
            conn.Open();

            adp.SelectCommand = cmd;
            adp.Fill(dtEmployeeInfo);

            if (dtEmployeeInfo != null)
            {
                DataRow data = dtEmployeeInfo.Rows[0];

                Session["fname"] = data["emp_firstname"].ToString();
                Session["lname"] = data["emp_lastname"].ToString();
                Session["empid"] = data["emp_id"].ToString();
            }
        }

        catch (Exception ex)
        {
            ex.Message.ToString();
        }

        finally
        {
            conn.Close();
        }
    }



HTML Markup:

<li class="rgt"><asp:Label ID="lblFullNameSession" runat="server" CssClass="rgtlabel"></asp:Label>&nbsp;&nbsp;<asp:LinkButton ID="lb_logout" OnClick="lb_logout_Click" runat="server">logout</asp:LinkButton></li>