Options to satisfy the question:
1.
Session State -> Only if configured for out-of-process and SQL Server.
2.
NoSql Database Solutions -> MonogoDb, RavenDB, Sqlite.org
3.
SQL Server Key/Value Singleton -> Create a table and store key/value pairs as a single entry in the table or create a generic key/value table. Keys will need to be unique and values will need to scalars only or multiple values crammed into one key using a deliminator. A generic key/value table will need to store all keys as strings and rely on type conversion either implicit to the program or stored as an extra column.
See below
http://en.wikipedia.org/wiki/Entity-attribute-value_model
How to design a product table for many kinds of product where each product has many parameters
4.
Create an XML file or other flat file and store/write key/values to it. May require special permissions.
I will likely go with option #3 because it satisfies my current requirements best but will explore the NoSQL solutions for future projects.