If 99/LLL/9999 mask is used and MaskType=Date is set, then in wrong value is displayed: instead of short name of month NaN is appears. This behavior also shows when UpdatePanel is used on web-page.
Comments: The "Date" MaskType of the extender is not designed for the textual representation of a month. If you want to show a date's month as text, use MaskType="None". In this case, MaskedEditExtender will not try to alter this field.
Comments: The "Date" MaskType of the extender is not designed for the textual representation of a month. If you want to show a date's month as text, use MaskType="None". In this case, MaskedEditExtender will not try to alter this field.