protected void btnReserve_Click(object sender, EventArgs e)
{
DateTime startTime = Convert.ToDateTime(txtStartTime.Text);
DateTime endTime = Convert.ToDateTime(txtEndTime.Text);
int spot_ID = drpSpot.SelectedIndex;
spot_ID++;
// Reading cookies
HttpCookie userName = Request.Cookies["USER_ID"];
string uid = userName != null?userName.Value.Split('=')[1] : "undefined";
ReservationData rd = new ReservationData();
int resId = rd.CreateNew(uid, spot_ID, startTime, endTime);
MessageBox.Show("Your reservation has been sucessful. Reservation ID:" + resId);
// write cookies
HttpCookie res_ID_cookie = new HttpCookie("RES_ID");
res_ID_cookie["RES_ID"] = "" + resId;
res_ID_cookie.Expires = DateTime.Now.AddHours(1);
Response.Cookies.Add(res_ID_cookie);
Response.Redirect("homePage.aspx");
}