Why can't we assign a foreach iteration variable, whereas we can completely modify it with an accessor?

Question

I was just curious about this: the following code will not compile, because we cannot modify a foreach iteration variable:

        foreach (var item in MyObj         


        

Answer 1

You can't modify a collection while it's being enumerated. The second example only updates a property of the object, which is entirely different.

Use a for loop if you need to add/remove/modify elements in a collection:

for (int i = 0; i < MyObjectList.Count; i++)
{
    MyObjectList[i] = new MyObject();
}