Is it unwise to have a static method be used for security validation in ASP.net?

There are some very important points that have more to do with the code that is not visible than the code shown in the question...

Each thread calling your static method has its own call stack. Every call to DoSomethingToString() has its own copy of the method's variables, completely independant of any other call to that method on another thread (unless you declare a variable as static, thats what you may be getting confused with - a static variable has only one instance that is accessible to multiple threads in your program).

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