Formatting double as string in C#

I have a Double which could have a value from around 0.000001 to 1,000,000,000.000

I wish to format this number as a string but conditionally depending on its size. So if it's very small I want to format it with something like:

String.Format("{0:.000000000}", number);

if it's not that small, say 0.001 then I want to use something like

String.Format("{0:.00000}", number);

and if it's over, say 1,000 then format it as:

String.Format("{0:.0}", number);

Is there a clever way to construct this format string based on the size of the value I'm going to format?

c# .net formatting

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