How to convert a textbox value (whole number) to double something like (0.00) in C#?

Question

Getting textbox value and converting it to double.

Answer 1

Double.Parse("3.5")
or

Double.TryParse(value, out number)

https://www.dotnetperls.com/parse

every type has its helper methods
int.parse
and also
double.parse

if the conversion is not succesfull
double.parse will throw a exception
double.tryparse will just return false.