Hi Naga,
Currently , this cannot be achieved in the RadMaskedTextBox or RadMaskedNumericInput control. However, there is a PITS feature request(MaskedInput: Possibility to enter numbers with non-fixed number of digits after the decimal separator) that we have previously logged. You can vote for it and this way you will increase its development priority.
Kind regards,
Petar Mladenov
the Telerik team
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