private void DataGrid1_ItemDataBound(object sender, System.Web.UI.WebControls.DataGridItemEventArgs e)
  {
   if(e.Item.ItemType == ListItemType.Item | e.Item.ItemType == ListItemType.AlternatingItem )
   {
    e.Item.Attributes.Add("onmouseover","this.style.backgroundColor='Silver' ");
    e.Item.Attributes.Add("onmouseout","this.style.backgroundColor='white' ");
   }

参考:
http://authors.aspalliance.com/Colt/Articles/Article3.aspx

另:按页数或者下一页生效:

private void DataGrid1_PageIndexChanged(object source, System.Web.UI.WebControls.DataGridPageChangedEventArgs e)
  {
   this.DataGrid1.CurrentPageIndex =   e.NewPageIndex;
   SetBind() ;//重新绑定
  }