Hello Kalyan,
You can change the default background color when a row is in its MouseOver state, through editing the template of GridViewRow. You should change the brushes that are used in the element Background_Over, which is of type Border. If you want to read more about GridViewRow's styling please see the following article
Styling a Row.
Attached is a sample that demonstrates this approach.
Sincerely yours,
Vanya Pavlova
the Telerik team
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