Dropdown List with ability to enter new values

pize used Ask the Experts™
Im wondering if it is possible to have a .NET asp web Dropdown control allow the user to select a value from the list or type in a completely new value.  I do not mean autocomplete type functionality, I mean actually allow them to type in a brand new value.  Kind of like having a free text box or being able to select from the list.
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Top Expert 2014

here is an example
Allowing users to select multiple items/add items
    <asp:TextBox ID="TextBox2" runat="server" />
    <asp:Button ID="Button" runat="server" Text="Add an additional item" OnClick="Button_Click" /><br /><br />
    <asp:DropDownList ID="DropDownList1" runat="server">        <asp:ListItem>Hematite</asp:ListItem>
Protected Sub Button_Click(ByVal sender As Object, ByVal e As System.EventArgs)
    End Sub

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