在DataGrid的ItemCreated事件里：Alternating_Color(e,"DataGrid1","#99CCFF");

public void Alternating_Color(System.Web.UI.WebControls.DataGridItemEventArgs MyE,string MyId,string MyColor)
  {
   //使DataGrid的行在鼠标滚动过的时候可以交替变色
   if(MyE.Item.ItemType == ListItemType.Item || MyE.Item.ItemType == ListItemType.AlternatingItem)
   {
    //加入鼠标进出行时变色的脚本
    MyE.Item.Attributes.Add("onmouseover","document.getElementById('" + MyId + "').oldValue = (this.style.backgroundColor==null)?'':this.style.backgroundColor;this.style.backgroundColor='" + MyColor + "';");
    MyE.Item.Attributes.Add("onmouseout","this.style.backgroundColor=document.getElementById('" + MyId + "').oldValue;");
   }
  }