How to solve error when converting string to real number?

Question

C++ / C#

You need to move the number behind a comma, did the conversion to double
and gives an error: 'Input string was not in a correct format.'
Although there is an English version of visual studio, it should count a dot, not a comma.
Maybe overlooked something

string stri = "0." + artQuantity;
double probability = Convert.ToDouble(stri);

Answer 1

1. It does not depend on the studio, but on the system locale.
2. When parsing, it is better to always explicitly specify the locale used.
In your case, this would work:

var str = "0." + artQuantity;
var probability = double.Parse(str, System.Globalization.CultureInfo.InvariantCulture);

Also check that there are no extra characters in artQunatity, such as spaces, periods, commas.