Format a number with commas and decimals in C# (asp.net MVC3)

Question

I need to display a number with commas and a decimal point.

Eg: Case 1 : Decimal number is 432324 (This does not have commas or decimal points).
Need to display it as: 432,324.00.
Not: 432,324

Case 2 : Decimal number is 2222222.22 (This does not have commas).
Need to display it as: 2,222,222.22

I tried ToString("#,##0.##"), but it is not formatting it correctly.

Answer 1

int number = 1234567890; Convert.ToDecimal(number).ToString("#,##0.00"); 

You will get the result 1,234,567,890.00.

Answer 2

Maybe you simply want the standard format string "N", as in

number.ToString("N") 

It will use thousand separators, and a fixed number of fractional decimals. The symbol for thousands separators and the symbol for the decimal point depend on the format provider (typically CultureInfo) you use, as does the number of decimals (which will normally by 2, as you require).

If the format provider specifies a different number of decimals, and if you don't want to change the format provider, you can give the number of decimals after the N, as in .ToString("N2").

Edit: The sizes of the groups between the commas are governed by the

CultureInfo.CurrentCulture.NumberFormat.NumberGroupSizes 

array, given that you don't specify a special format provider.