Question

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

I am trying to add commas to a number for the presentation layer and need to cast and then split the number on every third character in order to join on a ‘,’.

So if i have a string like this

546546555

desired output:

546,546,555

Other times, the number could be longer or shorter:

254654

desired output:

254,654

Is it possible to split in this manner then join with a comma?

tahnks!

EDIT:

Hi Everyone,

Thanks very much for your help.

To add to this post I also found a way to do this in SQL:

SUBSTRING(CONVERT(varchar, CAST(NumItems AS money), 1), 0, LEN(CONVERT(varchar, CAST(NumDocs AS money), 1)) – 2) as [NumDocs]

Answer 1

Rather than splitting the string manually, you should convert it to a number (or leave it as a number), and call the ToString method with the appropriate formatting:

Example

int value = 546546555;
string displayValue = value.ToString("#,#");

See this MSDN page for different format values:

C – Currency format

D – Decimal format

E – Scientific format

F – Fixed point format

G – General format

N – Number format

P – Percent format

R – Round trip format

X – Hexadecimal format