format number in C# [duplicate]

Question

Possible Duplicate:
.NET String.Format() to add commas in thousands place for a number

How to format a number 1234567 into 1,234,567 in C#?

Answer 1

For format options for Int32.ToString(), see standard format strings or custom format strings.

For example:

string s = myIntValue.ToString("#,##0");

The same format options can be use in a String.Format, as in

string s = String.Format("the number {0:#,##0}!", myIntValue);

Do note that the , in that format doesn't specify a "use a comma" but rather that the grouping character for the current culture should be used, in the culture-specific positions.

You also do not need to specify a comma for every position. The fact that there is a comma in the format string means that the culture-specific grouping is used.

So you get "1 234 567 890" for pl-PL or "1,23,45,67,890" for hi-IN.

Answer 2

var decimalValue = 1234567m; 
var value =  String.Format("{0:N}", decimalValue); // 1,234,567.00

or without cents

var value =  String.Format("{0:N0}", decimalValue); // 1,234,567