Non duplicate numbers in visual studio c# : I am making a C# script in visual studio for windows forms...
I need no get non duplicated numbers, and that is wha I have tried in that script, what happens is that I get this random numbers, but sometimes, those numbers are duplicated, so I would like if you tell me which mistake I have made, or even if the mistake is in that piece of code.
thanks.


  [1]: https://i.stack.imgur.com/RmLUa.png