What is ToString N0 format

Question

This code is from Charles Pettzold s  Programming Windows Sixth Edition  book   public object Convert object value  Type targetType  object parameter  string language          return   double value  ToString  N0         ToString  N0   is supposed to print the value with comma separators and no decimal points  I cannot find the reference to appropriate ToString overload and  N0  format in the documentation  Please point me to the right place in  NET documentation

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This is where the documentation is   http   msdn microsoft com en-us library dwhawy9k aspx     The numeric   N   format specifier converts a number to a string of   the form  -d ddd ddd ddd      where  -  indicates a negative number   symbol if required   d  indicates a digit  0-9        And this is where they talk about the default  2    http   msdn microsoft com en-us library system globalization numberformatinfo numberdecimaldigits aspx           Displays a negative value with the default number of decimal digits  2         Int64 myInt   -1234        Console WriteLine  myInt ToString   N   nfi

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Here is a good start maybe  Double ToString    Have a look in the examples for a number of different formating options Double ToString string

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Checkout the following article on MSDN about examples of the N format  This is also covered in the Standard Numeric Format Strings article  Relevant excerpts           Formatting of 1054 32179              N                      1 054 32              N0                     1 054              N1                     1 054 3              N2                     1 054 32              N3                     1 054 322    When precision specifier controls the number of fractional digits in the result string  the result string reflects a number that is rounded to a representable result nearest to the infinitely precise result  If there are two equally near representable results   On the  NET Framework and  NET Core up to  NET Core 2 0  the runtime selects the result with the greater least significant digit  that is  using MidpointRounding AwayFromZero   On  NET Core 2 1 and later  the runtime selects the result with an even least significant digit  that is  using MidpointRounding ToEven

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You can find the list of formats here  in the Double ToString  -MSDN-Article  as comments in the example section

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It is a sort of format specifier for formatting numeric results  There are additional specifiers on the link   What N does is that it separates numbers into thousand decimal places according to your CultureInfo and represents only 2 decimal digits in floating part as is N2 by rounding right-most digit if necessary   N0 does not represent any decimal place but rounding is applied to it   Let s exemplify   using System  using System Globalization    namespace ConsoleApp1       class Program               static void Main string   args                        double x   567892 98789              CultureInfo someCulture   new CultureInfo  da-DK   false                   10 means left-padded   right-alignment             Console WriteLine String Format someCulture    0 N  denmark   x                Console WriteLine   0 10 N  us   x                    watch out rounding 567 893             Console WriteLine String Format someCulture    0 10 N0    x                 Console WriteLine   0 10 N0    x                Console WriteLine String Format someCulture    0 10 N5    x                Console WriteLine   0 10 N5    x                 Console ReadKey                         It yields   567 892 99 denmark 567 892 99 us    567 893    567 893 567 892 98789 567 892 98789

[c#] What is ToString("N0") format?

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