public void binddata()
    {
        try
        {
            string   username = Convert.ToString(Session["username"]);
            DateTime today    = DateTime.Now;

            ds = obj.GetAppointment(username);
            if (ds != null)
            {
                GridView1.DataSource = ds;
                GridView1.DataBind();
            }
            else
            {
            }
        }
        catch (Exception e)
        {
        }
    }