ASP.NET Gridview - How do I change the color properties vertically?

I have a dynamic gridview, about 35 rows by 11 columns. When the user hovers over a row, I highlight the row's background in green (with CSS:Hover).

I would like to chang开发者_StackOverflow社区e the column's background as well, but I don't think I can assign css to a entire column. How can I accomplish this?

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this is how is done, step-by-step: http://css-tricks.com/row-and-column-highlighting/