How to debug my application exe at the client side.

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C#

Hi,

I am developing a windows application, that shows some perfomance issue at the client side.
So, I created a Debug Logger in file using this code after every line of code

#if DEBUG
    LogwithTime("This Process completed");
#endif

But I could not record the log, as the file is not running in the DEBUG mode...
How can I put it in DEBUG mode so that I could get the code between #if DEBUG and #endif to work?

Thanks