if n=myArray.Length or =myList.Count, which is a good practice to use?
<p>If we know that <code>int n = myArray.Length = myList.Count</code></p>

<p>Then, when we need to use this value to represent the array/list length, which one is best to use?
e.g. do we use <code>var x=n*2 or var x=myArray.Length*2 or var x=myList.Count*2</code></p>

<p>The equivalent question is like, would it be more efficient to directly use n instead of referring to the member property of an object?</p>
