You can use the Visual Studio SVN plugin to visually view changes in Visual Studio.
EDIT: as mentioned in my comment below, the next closest thing to what you are looking for is change tracking . As you learn in your comment, it will only work for your purposes, if the only time you save is when you build. I try to save as often as possible, though.
And yes, the default behavior of VS for auto save is saved upon creation.
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