How to input ,(comma) and .(dot) into the TextBox at the same time in c#

Question

I wanna know how to input , and . into the TextBox at the same time

ex)

1,234.22,
12,554.00,
555,448,999.513

thank you very much

Answer 1

Use String.Format to do that, example:

// Output will be 555,448,999.513
string s = string.Format(new CultureInfo("en-US"), "{0:n3}", 555448999.513);