Limit in textbox max number?

Question

WPF

Tell me how to do it, so that you can only drive up to n numbers.
if (!char.IsDigit(e.Text, 0)) e.Handled = true;
I limited the output to only numbers, but I also need to limit it from 0 to 20.
To be able to drive only from 0-20

Answer 1

Sorry, why not use NumericUpDown?
Accepts only numbers as input and you can set min/max values