Updating WSDL Reference but web config is not updated in ASP

I am using Visual Studio 2013 in my mvc web Appln project,wsdl was added, When i am adding new wsdl file using 'Add Service Reference' in project then respective bindings tags are not created in web.config file .
I tried unchecking 'Reuse Types' the tick when we Select 'Add Web Reference'

I read many blogs and post but didnt got any solution