In .NET, which loop runs faster, 'for' or 'foreach'?

Question

In C#/VB.NET/.NET, which loop runs faster, for or foreach?

Ever since I read that a for loop works faster than a foreach

Answer 1

In most cases there's really no difference.

Typically you always have to use foreach when you don't have an explicit numerical index, and you always have to use for when you don't actually have an iterable collection (e.g. iterating over a two-dimensional array grid in an upper triangle). There are some cases where you have a choice.

One could argue that for loops can be a little more difficult to maintain if magic numbers start to appear in the code. You should be right to be annoyed at not being able to use a for loop and have to build a collection or use a lambda to build a subcollection instead just because for loops have been banned.