Hi Gilbert,
As far as my observations go, RadNumericTextBox successfully manages to format the value
1.12345678901234567890. When it is blurred, the value is formatted to
1.123456789012345 with AllowRounding="False" and 15 dicimal digits. Testing with the latest version of RadControls 2010.Q1.415 (which you have indicated to be using).
Greetings,
Veli
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