how do create license for dll file in c#

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hi i create a dll that contain mostly use method .. (with class library in c#)
now i want to sell it ...
i worry for copy/paste by end-users

is there any method or application(free) to protect the dll ?

thanks

Posted 26-Dec-14 7:18am

Esmaeil Ebrahimi

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software_sushil · Answer 1 · 2014-12-28T19:03:00

Hi,

If you are going to use the class library in only your projects, then
declare a private variable with in the class and create a method with
argument to pass your password to be called after creating the object
of the class. If the password matches change the value of the variable
and when ever any method is called of the class check the value for the
variable and raise error accordingly.