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.gif"/>

not work code. How to make ?

error: StartIndex cannot be less than zero.
Parameter name: startIndex
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2 Answers 2

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Seems like there's no "." in your string, then IndexOf() returns a negative number.

http://msdn.microsoft.com/en/library/7cct0x33.aspx

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This bit:

IndexOf(".")

whill be returning -1 because the . is not found in the string you supplied.

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