Is Grouping Possible in asp.net dropdown list while databinding it?

Using just a dropdownlist? mmm

 I guess not , have you tried with a second control , i mean, using a textbox or a combobox to select  or write :"US" or "Canada"?, and by that way you start filling the dropdownlist?, in other case ,you can use a query in the datasource with REPLACE function,  but this won't work as a header properly ...

Yeah, that could be done. But the exact requirement is something like the "optgroup" property of html select list. But the problem is asp.net does not support this property.

I tried with dropdownlist control adapter, but my dropdownlist needs to be autopostback enabled. There is some problem happening regarding postback.

I need the exact rendering as the following does:

<option value="">Please select</option>
<optgroup label="Option A">
        <option value="1">1</option>
        <option value="2">2</option>
        <option value="3">3</option>
        <option value="4">4</option>
</optgroup>
<optgroup label="Option B">
    <option value="a">A</option>
    <option value="b">B</option>
    <option value="c">C</option>
</optgroup>

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