Hi Daniel
Thank you for the update.
The reported requirement to format the value in Scientific notation does not achieve in DoubleTextBox control, since our DoubleTextBox control, we would allow only to enter double value and not the string.
However you can use our SfTextBox control where you can format the value using the String Format such as "E" to convert in scientific notation in sample and assign to the control.
For More information about string formats , please find the link below:
Link:
https://msdn.microsoft.com/en-us/library/dwhawy9k(v=vs.110).aspx#EFormatString
Please try this solution and let us know if it is helpful.
Regards,
Vijayalakshmi V.R.