Thank you for the detailed explanation. As far as I can see in your case the RadNumericUpDown is ignoring the decimal separator. Could you please try if in the culture set on your PC the default decimal separator is not coma. In this case you are still able to enter a dot but it is ignored and so it is translated as a whole number.
Please try to set in the code behind:
and check if it will work as in Excel. If this doesn't help could you please send me a sample project where I can reproduce the issue.
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