1、一个MessageBox的例子
public static void MessageBox( System.Web.UI.Page page, string msg )
  {
   StringBuilder StrScript = new StringBuilder();
   StrScript.Append( "<script language=javascript>" );
   StrScript.Append( "alert('"+ msg +"');" );
   StrScript.Append( "</script>" );
   if ( ! page.IsStartupScriptRegistered( "MessageBox" ) )
   {
    page.RegisterStartupScript( "MessageBox", StrScript.ToString() );
   }
  }

2、DataGrid删除的确认：
在ItemDataBound事件中加入如下代码：
LinkButton delLink = new LinkButton();
   if (e.Item.ItemType == ListItemType.Item || e.Item.ItemType == ListItemType.AlternatingItem)
   {
    delLink = (LinkButton)(e.Item.Cells[0].Controls[0]);
    delLink.Attributes.Add("onClick","Javascript:return confirm('Are you sure to delete the record ?');");
   }