Entity Framework Volatile Isolation Level

Entity Framework Volatile Isolation Level

I found the following description for the Serializable
(IsolationLevel.Serializable) isolation level in the MSDN documentation:
Volatile data can be read but not modified, and no new data can be added
during the transaction.
(Reference)
And on the same page volatile data is defined as:
The data affected by a transaction is called volatile.
My question is, how can I prevent other transactions from reading volatile
data and also prevent them from adding any new data.
Thank you very much.