queries wcf

HI Experts

1.we have a 4 services ,every services is doing by individual.my question is should we take separate
wcf service application for each service or we have to take class library ,in class library we create 4 services
then make webapplication with svc file and deploy it in iis server?

which one will be the best.create a separate service or class library for all service.
issue:if there will be change in one service we need to the changes in class library then reference dll in web site
then again host in iis but for separate app other will not impacted?

please suggest pros and cons,which will be feasible approach

2.how to call web service from wcf service,please provide
code snippet.

A service ==> B Service
B service have method validate(name),A service will call B service and pass name parameter,
it will be validate in B service and if name is matched it will return true to A service otherwise false.
nicemanishAsked:
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nicemanishConnect With a Mentor Author Commented:
Hi srosebabu
 can you comment on this question
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Kalpesh ChhatralaSoftware ConsultantCommented:
Hello,

I suggest create one Service and create 4 Different Function/Class as per your requirement.

below example may help you

http://msdn.microsoft.com/en-us/library/ms751433.aspx
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nicemanishAuthor Commented:
well for the best practise.i used 1 wcf service appliaction.inside that application i addesd all 4 services svc and interface.2.i ahve taken the class library for datacontarct for each services.
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