Problems with integrating google calender

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C#

VB

ASP.NET

google-api

i am facing so much of confusions and problems while migrating from google api v2 over to v3.

I am dealing with the job scheduling of each employees in a company with the help of integrated google calender. i lost the full control while the provider change the version. let me know the following thing?

1. can i access the calender of an employee if his/her gmail id and its password is known?
2. is it needed to provide individual CLIENT ID and CLIENT secret?

3. what is the use of public Public API access(server key)

4. how to form the request url that must send to the server.

5. how to use the JSON file downloaded from the developer console


5. previously i was using the query as

Try
Dim myService As New CalendarService("test")
myService.setUserCredentials(user_name, user_password)
Dim query As New CalendarQuery()
query.Uri = New Uri("https://www.google.com/calendar/feeds/default/owncalendars/full")
Dim resultFeed As CalendarFeed = DirectCast(myService.Query(query), CalendarFeed)
Catch ex As Exception
radnote.Text = ex.ToString "Account not accessible, please verify your google account user name and password"
radnote.Show()
connect = 0
End Try