Started version 1.0.25. Added OrderModifyRequest. Changed function OrderModify to use request pattern.

MtApi/Requests/OrderModifyRequest.cs

@@ -0,0 +1,18 @@
+namespace MtApi.Requests
+{
+    public class OrderModifyRequest: RequestBase
+    {
+        public int Ticket { get; set; }
+        public double Price { get; set; }
+        public double Stoploss { get; set; }
+        public double Takeprofit { get; set; }
+        public int Expiration { get; set; }
+
+        public int? ArrowColor { get; set; }
+
+        public override RequestType RequestType
+        {
+            get { return RequestType.OrderModify; }
+        }
+    }
+}