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amrameshreddy.blog.com138 CHAPTER 4 ■ INSTALLING AND CREATING WCF SERVICESramrameshreddy.blog.comapplying policies and rules based upon the content of the SOAP request. If you can promoteor present some attribute of the request to the SOAP header, it’s easily validated before anydownstream code processes the request in your service implementation.If you take a look at the Trade class in Listing 4-25 (part of the accompanying code inExample09), you can see that it has been updated with a specific namespace in addition tobeing decorated with the DataMember attribute with a mix of fields and properties. Additionally,the Execution class, shown in Listing 4-26, has been similarly decorated.Listing 4-25. Trade Data Contract (Partial)namespace ExchangeService{[DataContract(Namespace = "http://PracticalWcf/Exchange/Trade" )]public class Trade{string _ticker;char _type;string _publisher;[DataMember(Name = "Participant", IsRequired = true, Order = 0 )]string _participant;[DataMember(Name = "QuotedPrice", IsRequired = false, Order = 1 )]internal double _quotedPrice;[DataMember(Name = "Quantity", IsRequired = true, Order = 1 )]private int _quantity;[DataMember(Name = "TradeTime", IsRequired = false, Order = 9 )]Nullable _tradeTime;double _executionAmount;/// /// Primary exchange security identifier/// [DataMember( IsRequired = true, Order = 3 )]public string Ticker{get { return _ticker; }set { _ticker = value; }}ramrameshreddyramrameshreddy