Converting double to string with N decimals, dot as decimal separator, and no thousand separator

Question

I need to convert a decimal to a string with N decimals (two or four) and NO thousand separator:

\'XXXXXXX (dot) DDDDD\'

The problem with CultureInfo.I

Answer 1

I think you could have used:
value.ToString("F"+NumberOfDecimals)

value = 10,502
value.ToString("F2") //10,50
value = 10,5 
value.ToString("F2") //10,50

Here is a detailed description of Numeric Format Strings