WCF Vs Web Services

WCF/ASP.Net Web Services are used for developing web services. Here is a list of differentiation between these two.

Feature	ASP.NET Web Service	WCF
Data Transformation	To and from Data Transition is done through XML Serializer	DataContractSerializer is used for data transition
File Extension	File extention is asmx	File extension is .svc
Webmethods vs DataContract Attributes	ASP.NET WebService uses Webmethods to to translate .NET FW types in to XML.	The WCF uses the DataContractAttribute and DataMemeberAttribute to translate .NET FW types in to XML.
Limitations	Only Public fields or Properties of .NET types can be translated into XML.Only the classes which implement IEnumerable interface. ICollection interface can be serializable	Public/Private fields or properties of .NET types can be translated.
IDictionary Interface class	Classes that implement the IDictionary interface, such as Hash table can not be serialized.	The DataContractSerializer can translate the Hash Table into XML. Hence using WCF we can even translate HashTable into XML
Performance	Slower compared to WCF	The main benifit of the design of the DataContractSerializer is better performance over XML serialization
Know which fields /properties	XMLSerialization does not indicate the which fields or properties of the type are serialized into XML	DataCotratSerializer Explicitly shows the which fields or properties are serialized into XML
Exception handling	In ASP.NET Web services, Unhandled exceptions are returned to the client as SOAP faults.	In WCF Services, unhandled exceptions are not returned to clients as SOAP faults. A configuration setting is provided to have the unhandled exceptions returned to clients for the purpose of debugging.
Example	[WebService] public class Service : System.Web.Services.WebService { [WebMethod] public string Demo(string strDemog) { return strDemo; } }	[ServiceContract] public interface ITest { [OperationContract] string ShowMessage(string strDemo); } public class Service : ITest { public string Demo(string strDemo) { return strDemo; } }

After you know the importance of the WCF on Webservices, to create and explore on your first WCF application