Question

Is there any reason to assign parameter values to local variables inside a method in order to use those values without changing them? I.e. like the following:

private void MyMethod(string path)
{
    string myPath = path;
    StreamReader mystream = new StreamReader(myPath);
    ...
}

Or can I always put it like this (and the code above is redundant and just not clean):

private void MyMethod(string path)
{
    StreamReader mystream = new StreamReader(path);
    ...
}

I know it works both ways, but I’d like to be sure there isn’t anything I missed in my understanding.

Answer 1

It’s exactly the same thing, the only difference is that in the first case you make a copy of the reference (which is destroyed anyway when the method gets out of scope, which happens when the execution ends).

For better readability, stick with the second case.