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Dropdown Lists and select all

Posted By:      Posted Date: October 21, 2010    Points: 0   Category :ASP.Net

Hi all,


I have a number of dropdown lists which are populated from a database.  They load depending on what the previous dropdown selection was so for example if the system was car based and I had chosen Ford then the next dropdown list would populate all cars made only by Ford.  What I'm wanting to do is add a select all to one of the dropdown lists.  Does anyone know how this would be done?  





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