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http://blogs.msdn.com/b/nav/archive/2011/04/15/how-to-change-thousands-decimals-separators-in-rdl-reports.aspx
Remenber:
in ReportLayout design we can find that every Textbox has property named Language. Value could be: Default, Afrikaans,Afrikaans (South Africa) and etc. So if we for example set Language = French, then decimal will be 1 234 567,89; if Language=German (Germany) - number will be 1.234.567,89, if Language=English (United States) - number 1,234,567.89 and etc.
