Answer:   C# supports two types of threads which are as follows :

1. Foreground Thread - A thread which keeps on running to complete its work even if the Main thread leaves its process.
2. Background Thread - A thread which leaves its process when the Main method leaves its process.

Answer:   Session Cookie – Resides on the customer machine for a solitary session until the client does not log out.
Tenacious Cookie – Resides on a client’s machine for a period indicated for its expiry, for example, 10 days, one month, and never.