How does initializing variables in a C# loop affect performance?

Question

PHP

Good evening, C# experts. I asked myself this question: "Does the initialization of variables in the loop affect performance? Or should variables be initialized outside the loop?". Performance is extremely important, as the application is multi-threaded (about 100 threads).
Example 1 (initialization outside the loop):

string response;
            for (int i = 0; i < 4; i++)
            {
                response = Send("DoSomething", "arguments");
            }

Example 2 (initialization inside the loop):

for (int i = 0; i < 4; i++)
            {
                string response = Send("DoSomething", "arguments");
            }

Which option is more productive? and is there any difference in the compiled IL code? (reflector'a is not at hand). Thanks in advance for your replies.

Answer 1

Notice: Undefined property: index::$TestUrl in /home/lucifer/php/Core/modules/router.php on line 29

Notice: Undefined property: index::$Test in /home/lucifer/php/Core/modules/router.php on line 29

Errors in the router.php file. On line 29.
Presumably in
It is not clear from the context what exactly is in the variables $id, $url, $func, $f

Answer 2

"How the initialization of variables in a loop affects performance" is always bad.
On the other hand, you could not be lazy and run both options for 100e6 cycles.
On the third hand, you can read "a rope long enough to shoot yourself in the foot" so that the level of your questions, te-skat, becomes less trivial.

Answer 3

Of course the first option is faster.
You don't waste time creating a string object.