listbox Refresh() in c#

Question

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


        

Answer 1

Windows forms to see changes especially on Listbox and other controls before load is finished is tricky. To see data as its loaded use invalidate(); then Update();