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For an application I had to develop for work, we had a need for an input field that allowed you to either select an item or type in your own item. Before AJAX, you would have to write create your own ComboBox or create something like an "Other" selection and then have a blank TextBox for your new item. Thankfully today we have AJAX and can accomplish this rather easily using the DropDownExtender, a TextBox, and a ListBox. Because speed was an issue, we also wanted to keep everything clientside.