Need help on simple type 'format' property

Hi Everybody
    Can  any body  help  me how can we use  the 'format' for specifying the external format of a simple type...
I want to  set the format of a double value by using a ,.
for example 1,900.000. Actually how it works if we use it in the
application . I tried it by giving the format as x,xxxx.xxx. and binded that simple type to a input field . when i run the application the displayed format is different..
Can I know when to specify External format. and how it functions when we use it
Thanks in Advance
madhavi

Hi,
   Try with the following format: "#,###.##".
Regards,
Satyajit.

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