Separate long numbers by 3 digits

Question

Is there a easy way to transform 1000000 in 1.000.000? A regex or string format in asp.net, c#

Answer 1

You can use ToString together with a formatting string and a format provider that uses '.' as a group separator and defines that the number should be grouped in 3-digit groups (which is not the case for all cultures):

int number = 1000000;
Console.WriteLine(number.ToString("N0", new NumberFormatInfo()
                                            {
                                                NumberGroupSizes = new[] { 3 },
                                                NumberGroupSeparator = "."
                                            }));