C# WPF Random ListBox - Remove object from one list box and add to another using a random

I am using a basic WPF application. In it I have a list of Persons with a few properties. When I run the application it populates a listbox with the Persons. I have a button to random an Persons based off of a selection(1-5). When this happens, I need to remove that Person/s and move him/her to another list box I have.

I get an error while in the first foreach loop. Not sure how to loop through the personListBox. Also need to move the person from personListBox1 to personListBox2.

I need the person removed from the 1st list so that when it loops again, it will not be there to be selected again. I plan on doing something with only the second list of persons. Thanks in advance guys.

Below is the random button I am trying this with.

private void randomButton_Click(object sender, RoutedEventArgs e)
    {
        if (this.numberComboBox.SelectedIndex != -1)
        {
            List<Person> personList = new List<Person>();                
            int number = Convert.ToInt16(this.numberComboBox.SelectedItem);

            // Add each person from the one list box to the other.
            foreach (Person P in this.personListBox.Items)
            {
                personList.Add(P);
            }

            // Loop the the selected number of times to remove and add from list to list.
            for (int i = 0; i < number; i++)
            {
                int randomValue = random.Next(personListBox.Items.Count);                    
                // Need to remove the person from personListBox1 here
                // Then move them to personListBox2
            }
        } 
        else
        {
            MessageBox.Show("Please select a number before trying to random.");
        }
    }