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

Alternatively and probably the most correct way to implement this is to use the provided ObservableCollection. It is designed with the sole purpose of implementing INotifyCollectionChanged.

public partial class MyForm : Form
{
    ObservableCollection data = new ObservableCollection();

    public MyForm()
    {
        listBox1.DataSource = data;
        listBox1.DisplayMember = "Name";
        listBox1.ValueMember = "Id";
    }

    private void buttonAddData_Click(object sender, EventArgs e)
    {
       var selection = (MyData)comboBox1.SelectedItem;
       data.Add(selection);
    }
}

Because ObservableCollection implements INotifyCollectionChanged the DataSource binding will automatically update the ListBox whenever your data changes.