Error: The currency separator information specified in the NumberFormatInfo is ambiguous for parsing

In the solution of the question of the same title the follwing solution is given:
If any of the group separators ( NumberFormatInfo.NumberGroupSeparator, NumberFormatInfo.CurrencyGroupSeparator, or NumberFormatInfo.PercentGroupSeparator) is the same as any of the decimal separators ( NumberFormatInfo.NumberDecimalSeparator, NumberFormatInfo.CurrencyDecimalSeparator, or NumberFormatInfo.PercentDecimalSeparator), parsing ambiguous strings produces unpredictable results. If you explicitly set any of the group separator properties in NumberFormatInfo to a value that is the same as any of the decimal separators or if you explicitly set any of the decimal separators to a value that is the same as any of the group separators, ArgumentException is thrown.
But no way to solve the problem by interaction with the control panel / International Settings.
In particular, how can be set from the control panel the PercentGroupSeparator and the PercentDecimalSeparator?
leoprex1Asked:
Who is Participating?
 
Jens FiedererTest Developer/ValidatorCommented:
Oh...MUI stands for Multilingual User Interface Technology, by the way.
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Jens FiedererTest Developer/ValidatorCommented:
Are you saying there is a difficulty with sequence here?

I.e., if you set PercentGroupSeparator to the same value as PercentDecimalSeparator you get a problem?

You could get around that by using an intermediate value.  Say you want to reverse current values of
PercentGroupSeparator=","
PercentDecimalSeparator="."

Just do
PercentGroupSeparator="!"
PercentDecimalSeparator=","
PercentGroupSeparator="."
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leoprex1Author Commented:
Jensfiederer,
are you speaking setting the PrecentGroupSeparator programmatically or via Control Panel?
I do not know how to do it via Control Panel.
The problem arises on a PC to which I have not access and on which my software has been loaded.
People tried to set international settings as standard culture Italian or english-us without success.
They verified that the DecimalSep and GroupSep for numbers and currency are OK.
They get always this error. It occurs the first time the program passes to a subroutine an argument string.
Thank you for your cooperation
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Jens FiedererTest Developer/ValidatorCommented:
I thought you might be doing it programmatically, and possibly getting an error involving order of operations.

Doing it via Control Panel is easy, and needs no workarounds...you just go into "Regional and Language" options and set the separators.
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Jens FiedererTest Developer/ValidatorCommented:
If you want to USE what you set in the control panel, use

system.Globalization.CultureInfo.CurrentUICulture.NumberFormat
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leoprex1Author Commented:
My point is that in Regional settings I found the settings for the numbers and for the currency, but not for the percentages.
Another question:
which is the difference between Threading.Thread.CurrentThread.CurrentCulture and Globalization.CultureInfo.CurrentUICulture?
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Jens FiedererTest Developer/ValidatorCommented:
This link describes the differences:
http://www.developersdex.com/vb/message.asp?p=4102&ID=%3CO3u2BuKVGHA.2156%40tk2msftngp13.phx.gbl%3E

When you set the numeric format from the control panel, it ALSO (at least on my machine) changes PercentDecimalSeparator.  

Oddly, the first time I tried it I could see the difference in system.Globalization.CultureInfo.CurrentUICulture (but not in system.Globalization.CultureInfo.CurrentCulture), and the second time I tried it I could see the difference only in system.Globalization.CultureInfo.InstalledUICulture.

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