Removing alternate elements in a List

Question

What is the most efficient way to remove alternate (odd indexed or even indexed) elements in an List without using a place holder list variable?

A

Answer 1

I'm not sure what you mean by alternate but if you mean "every other item" the following code will work. It will start by removing the 2nd element, then the 4th, and so on

List list = GetTheList();
int i = 1;
while ( i < list.Count ) {
  list.RemoveAt(i);
  i++;
}