As Andrew Hare suggested in his answer:

Create a field to store all the ListBox instances and then change the constructor to accept an arbitrary number of them: by

I tried the following

class scaner
{
    readonly IEnumerable<ListBox> listBoxes;

    public IEnumerable<ListBox> ListBoxes
    {
        get { return this.listBoxes; }
    }

    public scaner(params ListBox[] listBoxes)
    {
        this.listBoxes = listBoxes;    
    }
}

This will allow you to do this:

scaner Comp = new scaner(listBox1, listBox2);

How can i access listbox1?

In class scaner i'm trying to call this.listBoxes.
(I need to call the listbox1 in scaner class.How can i do/call it?

Thanks for answers.