How To Store a value & access From different pages

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ASP.NET

how can i store value in website & can be accessed be in any page of the website ....

I have used
1) Application State
2) Cache

it store a single value which is overwrites to previous value

Eg

user1---- have access a page and a value is store in application State/ Cache - "Hello"

Note: [ still user1 is online & on the same page ]

after that

user2--- have access a page and a value is store in application State/ Cache - "Hi"

but when user1 access the same page or some other page the value is changed and to overwrite by the value of user2 i.e "Hi"

What is this ..............

I have also used Session , But after sometime it got expired or over written by another value of some page which also use to store some value in session ....


So , Help Needed.........................................................