Global ændring af landeindstillinger

Jeg tror du skal have fat i system.blobalization namespace
nærmere bestemt NumberFormatInfo.

se http://msdn.microsoft.com/library/default.asp?url=/library/en-us/cpref/html/frlrfsystemglobalizationnumberformatinfoclasstopic.asp

"The user might choose to override some of the values associated with the current culture of Windows through Regional and Language Options (or Regional Options or Regional Settings) in Control Panel. For example, the user might choose to display the date in a different format or to use a currency other than the default for the culture. If the CultureInfo.UseUserOverride property is set to true, the properties of the CultureInfo.DateTimeFormat instance, the CultureInfo.NumberFormat instance, and the CultureInfo.TextInfo instance are also retrieved from the user settings. If the user settings are incompatible with the culture associated with the CultureInfo (for example, if the selected calendar .."

øh System.Globalization.....

Ellers kan man prøve at skrive:
<globalization 
fileEncoding="iso-8859-1" 
requestEncoding="iso-8859-1" 
responseEncoding="iso-8859-1" 
  culture="da-DK" 
uiCulture="da-DK"  />
i sin web.config?