Infinite Sql Insert

I am going to have a page with a simple textbox requesting a phone number. It will also use Ajax Control Toolkit's MaskedEdit. I would like to give my user the ability to add another textbox with the same features and have each phone number inserted into a SQL table. The only other stipulations would be that they would be able to delete a textbox once they created it and VB.NET.
<p class="txt_default">Phone Number:<br /><asp:TextBox I ...