protected void Button_delete_Click(object sender, EventArgs e)
{
PhysicsBooking b2 = (PhysicsBooking)ViewState["PhysicsBooking"];
b2.Delete();
Add_Controls(b2); TextBox_Notes.Text = "";
}
protected void Button1_Click(object sender, EventArgs e)
{
PhysicsBooking pb1 = (PhysicsBooking)ViewState["booking"];
pb1.Delete();
string s = (string)ViewState["ref"];
Response.Redirect(s);
}