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what are the effect of warning message in my program

user472
1#
user472 Published in June 23, 2018, 7:56 am

What is the effect of the warning message? Like my Program gives warning ex is declared but never used. I understand that I am not using ex in my program. But i want to know what exactly issue if I declared this type or variable and never used. Is this using memory or slow down my program or anything else.

    catch( Exception ex)
        {
        // Not using Ex in only declared to track when I debugging the code
        }
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