Returns number of all open orders.
SYNTAX
public int Count { get; }EXAMPLE
 using System;
 using System.Collections.Generic;
 using System.Linq;
 using System.Text;
 using PTLRuntime.NETScript;
 namespace Examples
 {
     public class OrdersCollectionExample : NETStrategy
     {
         public override void Init()
         {
             Print(
                 Orders.Count+ " :orders without SLTP\n" +
                 Orders.SLTPCount + " :SLTP orders"
                 ); 
         }
     }
 }