Hi Vasanth,
Thanks for your interest in Syncfusion Products.
Currently SfNumericTextBox doesn't have support for Min/Max value like in SfNumericUpdown. But we have prepared a sample which tries to meet your requirement.
Sample :
NumericTextBox_119407
In this sample we have derived a new class and provided properties for Min/Max value and also ValidationMode.
Please let us know if the sample helps you or in case of any concerns.
Regards,
Muthukumar A