Should variable declarations always be placed outside of a loop?

Question

Is it better to declare a variable used in a loop outside of the loop rather then inside? Sometimes I see examples where a variable is declared inside the loop. Does this ef

Answer 1

As is the case with lots of simple optimizations like this, the compiler takes care of it for you. If you try both of these and look at the assemblies' IL in ildasm you can see that they both declare a single int32 read variable, although it does reorder the declarations:

  .locals init ([0] int32 read,
           [1] uint8[] buffer,
           [2] bool CS$4$0000)

  .locals init ([0] uint8[] buffer,
           [1] int32 read,
           [2] bool CS$4$0000)