User-742633084 posted
Hi atulthummar,
When you creating WCF client proxy (either via Add ServiceReference or svcutil.exe), it use Array type for collection classes (defined in service Contract) by default. To change the behavior, you can specify "collection type" either in the "Advanced..."
option setting of Add ServiceReference dialog:
#Configure Service Reference Dialog Box
http://msdn.microsoft.com/en-us/library/bb514724(v=vs.110).aspx
or use the "/collecitonType" (/ct) option of svcutil.exe tool:
#ServiceModel Metadata Utility Tool (Svcutil.exe)
http://msdn.microsoft.com/en-us/library/aa347733(v=vs.100).aspx