Relocating items in a list

How can I make two items exchange their positions in a List<T>? For example, item 3 moves t开发者_StackOverflow中文版o position 1 and item 1 goes to position 3 in a list with five items. Thanks.

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Just save one of the items in a variable before you overwrite it:

var temp = list[1];
list[1] = list[3];
list[3] = temp;