The light bar for the GridView control

Add the following codes to your GridView's RowDataBound event:

protected void gv_RowDataBound(object sender, GridViewRowEventArgs e)
{
  if (e.Row.RowType == DataControlRowType.DataRow)
  {
    e.Row.Attributes.Add("onmouseover", "currentcolor = this.style.backgroundColor;this.style.backgroundColor='#6699ff'");
    e.Row.Attributes.Add("onmouseout", "this.style.backgroundColor = currentcolor");
  }
}

Move your mouse over the GridView control and you will see the result.