Formattting numbers

I would like to format the number 12345 into 12,345. How can I achieve this?

in C#:
int num = 1234567890;
String numFormatted = num.ToString("#,#");

Check out this documentation for more specifics on number formatting:

http://msdn2.microsoft.com/en-us/library/0c899ak8(VS.71).aspx

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I would like to acheive this in reporting services.

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I found out. I can make it using the format tab in properties of the textbox