I want to prompt the user to enter up to four specific months as an input on my page. Should I use a textbox control and just apply validators to it? or a check list box? which would control what the user puts it and would make it easier to iterate through the selected items? The only concerns I have are the looks of the list box. Can I make it look and feel like a drop down box? Also, how do I limit the selection to 4? If I use a text box, how do I validate that "up to" 4 items are entered let's say separated by a comma?