Out write rate into a string - Operator '/' cannot be applied to operands of type 'string' and** > 'double'

Question

it is such that I must have written price in a string to be displayed to users.

right now will give this error is

Operator \'/\' cannot be

Answer 1

prisenMedlemskab seems to be a string, so you cannot divide it for a number. Try to convert as follows

Double moms = 1.30;
ButtonPay.Text = "Buy Membership - DKK " + (Convert.ToDouble(prisenMedlemskab) / moms).ToString("F2") + ",- Kr";

By the way is safer to convert prisenMedlemskab before use it directly so you can check if converted value is a legal one (so if prisenMedlemskab has an actual convertable value)

Answer 2

As far as I can tell you, prisenMedlemskab is a string and not an integer You have to parse it.

e.g.

double prisenMedlemskabDouble = double.Parse(prisenMedlemskab);

And then do

ButtonPay.Text = "Buy Membership - DKK " + (prisenMedlemskabDouble / moms).ToString("F2") + ",- Kr";