Hey this is client side what u r talking about .... U dont need ASP ... use Javascript or CSS ... Can u throw light on how u like to highlight ...
I'm going to take a guess based on the title of your request. If you are by chance using a datagrid in dotNet which has a selectedRow property, you can set the color properties of the selectedRow in the Properties of the grid control. It will happen client side with javascript, but it will be done for you by setting it in the dotNET IDE.
to do it clientside, create a css class in your stylesheet like: .active td {background:red;} .general td {background:green;} then add this to a javascript block function activate(obj) { obj.className = 'active'; } then in your html you can do: <table cellspacing="0" border="1" cellpadding="0"> <tr onclick="activate(document.getElementByID('tr1'))" id="tr1" class="general"> <td>hello</td> <td>world</td> </tr> <tr onclick="activate(document.getElementByID('tr2'))" id="tr2" class="general"> <td>Nice Day</td> <td>Hey?</td> </tr> <table>