listbox Refresh() in c#

Question

int[] arr = int[100];
listBox1.DataSource = arr;
void ComboBox1SelectedIndexChanged(object sender, EventArgs e)
{
    .....//some processes
    listBox1.DataSource =         


        

Answer 1

Managed to do just with

FirstListBox.DataContext = null;
FirstListBox.DataContext = App.ViewModel;

Simply loses link and get all the data back to it.