There are several ways to determine the Assembly Version Number, although probably the easiest is opening the controls smart-tag in Visual Studio 2005 design view. The version number is listed in the bottom-right corner. See:

Another way to view the version number is by opening a page in a browser and viewing the HTML source code. The version number is listed just inside the wrapping <span> of the control. Example:
<span id="BasicDatePicker1" class="basicdatepicker">
A third way is to open File Explorer and browse to your projects /Bin/ directory. Select the BasicFrame.WebControls.BasicDatePicker.dll file, then right-click and view "Properties". Under the File version should be listed under the "Version" tab.
Hope this helps.
Thanks,
Geoffrey McGill
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Coolite Inc.
Email: support [at] coolite [dot] com
Phone: +1(888)775-5888