One is an index and one is an offset which are two different things. Think of the offset of moving the caret over 1 char at a time. If you move 8 times you end up on the a.

+++ Rick ---

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>string str = "This is another substring test";
>  retString = str.Substring(8, 1);
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>will return "a"
>That makes no sense to me but I program accordingly.
>The great Scottish empiricist, David Hume, when asked why he did things that worked practically- but couldn't be logically proven= said:
>"It pains me too much to do otherwise."
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>>Sorry, couldn't resist. All of these things are man-made and like any other rule or law devised by hopefully clever people, we just have to live with it. ;-)
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>>Meanwhile be thankful you're not enjoying the wonderful byzantine pleasures of C++ strings that are arrays. ;-)