Hi Sachin,
RadNumericTextBox does not support numbers that large, and this limitation comes from the javascript numeric parsing. Javascript itself does not support calculations with numbers that large and RadNumericTextBox uses these calculations for parsing, storing and retrieving the entered value.
For numbers that large, you are encouraged to use
RadInputManager and regular expressions with a standard TextBox control.
Here is also a demo.
Sincerely yours,
Veli
the Telerik team
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