C#

private void PopulateComboSmart(ComboBox combo, DataTable table, string displayMember, string valueMember, AutoCompleteStringCollection dataCollection)<br />
{<br />
    combo.DataSource = table;<br />
    combo.DisplayMember = displayMember;<br />
    combo.ValueMember = valueMember;<br />
<br />
    combo.AutoCompleteCustomSource = dataCollection;<br />
    combo.AutoCompleteMode = AutoCompleteMode.SuggestAppend;<br />
    combo.AutoCompleteSource = System.Windows.Forms.AutoCompleteSource.CustomSource;<br />
<br />
    combo.SelectedItem = null;<br />
}