Forcing decimal numbers to use comma in ArcGIS Field Calculator?

Can I add the comma "," to force the decimals to remove from the attribute and replace with the number?

For example, I have an Acres field column that says 506320.0750 and I want to replace the decimal with the comma, say 506,320? I want that number to be permanment.

Is that possible? I'm using ArcGIS Desktop 9.3.1

Answer

If you force it you would need to convert from numeric to text.
What you want to do is change the display. Open the field properties dialog by right clicking on the field name in the attribute table..

click the ellipses next to numeric...
then in the number format dialog select the number of decimals you desire.
then show thousands seperator check box.