what is wcf and why it is used when it is used ?

WCF is windows communication Foundation it's known as code name indigo,It is Service Oriented Architecture not for COM Oriented. WCF used as Web Service,MSMQ,WAS,COM+ for more info visit at http://pramod-lawate.blogspot.in/2013/08/simple-wcf-service.html

WCF is windows communication foundation. It is framework which combines the various features like web services, windows services, MSMQ, COM+ etc.