This provides a list of WCF FAQs-3 which are of "Difference between" kind

1. 1.Difference between WCF Data Services and WCF RIA Services
S.No WCF Data Services WCF RIA Services
1 Supported Clients: Supported Clients:
Resource-based API, supports all Domain-based API, most tailored for
clients via deep REST and OData use with Silverlight, but supports other
support. clients via SOAP, JSON, and OData.
2 Supported Data Access Layers : Supported Data Access Layers :
Targets EF. Other DALs are Supports EF, LINQ to SQL, and
supported, but greater effort is POCO (custom persistence layer).
required.
3 Client Development : Client Development :
Requires you to notify the context Supports self-tracking entities,
for change tracking. synchronized client/server logic, and
much more (particularly with
Silverlight).
4 Service Development : Service Development :
Instant, code-less, extensible Requires you to code CRUD
REST services out of the box operations manually in domain service
(with EF); “free CRUD.” classes.
Another good reference:
http://silverlighttime.blogspot.in/2011/04/what-is-difference-between-wcf-data.html
2.Difference between Close and Abort in WCF Channels
S.No Close Abort
1 Close performs graceful shutdown Abort shut downs Client channel
of Client Channel immediately.
2 Close waits for in progress calls to Abort ends in progress calls.
complete before closing
3 Close should not be called in Abort should be called in faulted
faulted channels as it can throw channels.
Communication or Timeout
exception

2. 3.Difference between ASMX and SVC
S.No ASMX SVC
1 Web service class inheritance for There is no Web service class
ASMX is called WebService inheritance for SVC.
2 In ASMX,Web service class In SVC,Web service class attribute is
attribute is called as called as ServiceContractAttribute.
WebServiceAttribute.
3 In ASMX,Web service method In SVC,Web service method attribute
attribute is called as is called as
WebMethodAttribute. OperationContractAttribute.
4 In ASMX,Data class attribute is In SVC,Data class attribute is called as
called as XmlRootAttribute DataContractAttribute.
5 In ASMX,Data class field In SVC,Data class field attribute is
attribute is called as called as DataMemberAttribute.
XmlElementAttribute
6 In ASMX,HTTP endpoint In SVC,HTTP endpoint resource is
resource is called as .ASMX. called as .SVC
7 In ASMX, Serialization attribute In SVC, Serialization attribute is called
is called as XMLSerializer as DataContractSerializer attribute.
attribute.
And, further updates on difference between questions and answers, please visit my blog @
http://onlydifferencefaqs.blogspot.in/