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When a program runs in release mode you usually wanna catch all errors. When it doesn't you just wanna let it crash.
To make a function depend on debug vs release you can use 2 methods:

Using precompile statements

#if DEBUG
  // do something for debug 
#else
  // do something else
#endif

Or you can make a method depend on release vs debug using a conditional.

[Conditional("RELEASE") ]

In general try catch all is considered bad practice.