How to check a given string is float-point in (c#) ?thanx

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From: zjut (zjut_at_discussions.microsoft.com)
Date: 01/06/05 

Date: Wed, 5 Jan 2005 19:27:01 -0800

I need to implement the method : round(String name, int index)

The given string maybe the every type of float type, ( the msdn given the
regax is that :
[ws][sign]integral-digits[.[fractional-digits]][e[sign]exponential-digits][ws])

and the index is the location after "." in name.
First, i should check the given name is a valid float-point, and then,
to check the number in name in index locaion is > 0 or not?
eg:
round(123.45612, 2) is that the "5" is > 0 .

I indeed need your help , can you give me some coder or some advice .
appreciate very much.

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