Question

Why it is not advised (in a best pratice meaning) to manage all the exceptions of a system from the entry point.

class Program
    {
        static void Main(string[] args)
        {
              try
              {
                 [...]//all the program stuff
              }catch(Exception ex)
              {
                    [...]
              }
        }
    }

edit :
in a second point does it change something for the performance?

Answer 1

It’s not advised in the meaning that you should catch exceptions in places where you can actually handle them in a useful way.

If there is nothing you can do about the exception but crash, your solution works, but consider for example a missing file giving you an exception. Would you rather handle it with a dialog in the “OpenFile” method (or in this case maybe the part of the method where you open the file) and possibly give the user a chance to browse to where the file is before proceeding, or would you rather have it throw back to main and have no real option except “log and crash”?