Scope of static Variable in multi-user ASP.NET web application

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Does static variables retain their values across user sessions?

Yes, that’s why you should be VERY careful when you use static variables in a web app. You will run in concurrency issues as more than one thread servicing a request can modify the value of the variable.

While this works in single-user environment, What happens if there are
2 users simultaneously logged in from two computers, User 1 sets the
value as 100, then User 2 sets the value as 200. after that user 1
invokes the Get Value button. What will he see as the value?

The user will see 200 afterwards.

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