vb.net - Is format ####0.000000 different to 0.000000? -

i working on legacy code @ moment , have come across following:

foostring = string.format("{0:####0.000000}", foodouble) 

my question is, format string here, ####0.000000 different 0.000000?

i'm trying generalize return type of function sets foodouble , checking make sure don't break existing functionality hence trying work out # add here.

i've run couple tests in toy program , couldn't see how result different maybe there's i'm missing?

from msdn

the "#" custom format specifier serves digit-placeholder symbol. if value being formatted has digit in position "#" symbol appears in format string, digit copied result string. otherwise, nothing stored in position in result string.

note specifier never displays 0 not significant digit, if 0 digit in string. display 0 if significant digit in number being displayed.

because use 1 0 before decimal separator 0.0 - both formats should return same result.