Why Is ToString() Rounding My Double Value?

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By default the .ToString() method of Double returns 15 digits of precision. If you want the full 17 digits that the double value holds internally, you need to pass the “G17” format specifier to the method.

String s = value.ToString("G17");

Sourced from the MSDN docs:

By default, the return value only
contains 15 digits of precision
although a maximum of 17 digits is
maintained internally. If the value of
this instance has greater than 15
digits, ToString returns
PositiveInfinitySymbol or
NegativeInfinitySymbol instead of the
expected number. If you require more
precision, specify format with the
“G17” format specification, which
always returns 17 digits of precision,
or “R”, which returns 15 digits if the
number can be represented with that
precision or 17 digits if the number
can only be represented with maximum
precision.

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