Which format string to displays the float as is?

Question

I have a float of about 27 significant figures, when I call "ToString()" I get "6.8248054E+26", how do I get the exact normal value?

Answer 1

I know you want to display 27-digit significant figure and you use float. You can always do like this:

f.ToString("F27");

But really, they just don't match. Consider using decimal to achieve that precision:

decimal dc = 91.123142141230131231231M; //your 27-digit figure:
dc.ToString("F27");

Answer 2

var number = 0.111111111100000000000000000;
string result = String.Format("{0:#,0.###########################}", number);

This would show all decimals places up to the 27th, but omits all trailing zeros. So the above number would be displayed as 0.1111111111.