Q:

how to format 1700 to 1'700 and 1000000 to 1'000'000 in c#?

I like to format all numbers like in math. is there a predefined function or is that just possible with substring and replace?
edit: my culture is de-ch
Best regards

A:

Try this
int input = Convert.ToInt32("1700");
string result = String.Format("{0:##,##}", input);

Or this
Console.WriteLine(1700.ToString("##,##", new NumberFormatInfo() { NumberGroupSeparator = "'" })); 

A:

var numformat = new NumberFormatInfo {
                   NumberGroupSeparator = "'",
                   NumberGroupSizes = new int[] { 3 },
                   NumberDecimalSeparator = "."
                };
Console.WriteLine(1000000.ToString("N",numformat));

