Can you elaborate on that What are the uses of using? Similarly, if within using body something may happen, which is not directly related to the variable in using, then i wrap it with another try for that particular exception I rarely use exception in my catch es. 46 justin lessard's answer explains the difference between using and await using, so i'll focus on which one to use Either the two methods dispose / disposeasync are complementary, or they are doing something different.
182 in c++11, the using keyword when used for type alias is identical to typedef The using statement is used to work with an object in c# that implements the idisposable interface The idisposable interface has one public method called dispose that is used to dispose of the object. But if you put the using declaration inside a namespace it's limited to the scope of that namespace, so is generally ok (with the usual caveats on your particular needs and style). The problem with putting using namespace in the header files of your classes is that it forces anyone who wants to use your classes (by including your header files) to also be 'using' (i.e Seeing everything in) those other namespaces
Of all the advantages using provides, it can't be combined with other predicates Select*from t join t2 using(i) and on 1 wouldnt work. A using statement can be exited either when the end of the using statement is reached or if an exception is thrown and control leaves the statement block before the end of the statement.
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