Is it better to declare a variable inside or outside a loop?

Question

Is better do:

variable1Type foo; 
variable2Type baa; 

foreach(var val in list) 
{
    foo = new Foo( ... ); 
    foo.x = FormatValue(val); 

    baa = new B         


        

Answer 1

It doesn't matter, it has no effect on performance whatsoever.

but I really want know to do right way.

Most will tell you inside-the-loop makes the most sense.