How to refresh DataSource of a ListBox

Question

Form has one Combobox and one ListBox. When the \"Add\" button is clicked, I want to add the selected item from the ComboBox to the ListBox.

public partial c         


        

Answer 1

The listbox didn't detect that you have changed the DataSource. It will only refresh when Datasource has changed, so set DataSource to null first:

listBox1.DataSource = null;
listBox1.DataSource = data;

You could also clear the items then set the DataSource again:

listBox1.Items.Clear();
listBox1.DataSource = data;