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lang-cs
nullis cast tofalse. So, if the result of the assignment is null, the statement evaluates tonullwhich is then cast tofalse. That is why in some languages you can useif(var) {...}to execute code only if that variable is non-null. Generally, assigning to variables in anifstatement is poo-pooed because it looks like a common error (typing=instead of==). One used to be able to gain some (small) performance benefit from using an assignment in anifblock, but many modern compilers will do optimizations like this for you.null!=falsein C#; C# only allows actual bools or things implicitly convertible to bools inifconditions. Neither nulls nor any of the integer types are implicitly convertible to bools.