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Follow below links that may help you:
http://www.c-sharpcorner.com/UploadFile/2b481f/how-we-can-use-google-calendar-in-asp-net-through-google-ap/
http://bamboobig.blogspot.sg/2014/01/aspnet-mvc-4-using-google-calendar-api.html
https://developers.google.com/google-apps/calendar/quickstart/dotnet
https://github.com/google/google-api-dotnet-client-samples/tree/master/Calendar.ASP.NET.MVC5