Hi Buffer,
Here is the method that is failing in RadMaskedTextBox.cs:
As you can see, if the text value coming from the post data cannot be parsed into
double type, the control throws the exception you are getting. As you can note, this method is
virtual, so you can make a custom numeric textbox class by inheriting RadNumericTextBox and overriding this method to not thrown an exception, or alternatively, do some other action against possible injection attacks.
All the best,
Veli
the Telerik team
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