Visual Studio 2015 suddenly don't want to create new variables in classes [closed]

Answer 1

Is it possible to declare variables then assign values to those variables outside of a function?

Try to do this:

public class Similarity
{
    public string index;
    public double distance;
    public double similarityRate;
    public Similarity(string index, double distance)
    {
        this.index = index;
        this.distance = distance;
    }

    int b = 100;  //new code
}