How to customize asp.net DropDownList to support custom data bound field
<p>Is there any way to customized asp.net dropdown list to support custom data bound filed. it shouldn't be a custom property for the control. it should be able to bind data through <code>DataBind();</code> method with the same datasource. in this custom server control i'm trying to access new custom field and based on that value i will do some calculation for that specific row of the data source.</p>

<p>standard control code</p>

<pre><code>&lt;asp:DropDownList runat="server" DataTextField="TextField" DataValueField="ValueField"/&gt; 
</code></pre>

<p>new customized control should looks like this,</p>

<pre><code>&lt;asp:DropDownList runat="server" DataTextField="TextField" DataValueField="ValueField" DataCustomField="CustomField"/&gt;
</code></pre>
