[c#] What is the correct way to free memory in C#

The garbage collector will come around and clean up anything that no longer has references to it. Unless you have unmanaged resources inside Foo, calling Dispose or using a using statement on it won't really help you much.

I'm fairly sure this applies, since it was still in C#. But, I took a game design course using XNA and we spent some time talking about the garbage collector for C#. Garbage collecting is expensive, since you have to check if you have any references to the object you want to collect. So, the GC tries to put this off as long as possible. So, as long as you weren't running out of physical memory when your program went to 700MB, it might just be the GC being lazy and not worrying about it yet.

But, if you just use Foo o outside the loop and create a o = new Foo() each time around, it should all work out fine.

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