1.ClientScript.RegisterStartupScript(GetType(),"message","<script>alert('第一种方式,无白屏!');</script>");
2.HttpContext.Current.Response.Write("<script>alert('第二种方式,有白屏!')</script>");
3.public static void Show(System.Web.UI.Page page, string msg)
    {
        page.ClientScript.RegisterStartupScript(page.GetType(), "message", "<script language='javascript' defer>alert('" +  msg.ToString() + "');</script>");
    }
  Show(this, "第三种方式,无白屏!");
4.Response.Write("<script>alert('第四种方式,有白屏!')</script>");

5.window.showModalDialog('XXX.aspx', '', 'dialogWidth:429px;dialogHeight:200px;location:no,menubar:no,toolbar:no,status:no');

 

6、关闭页面两种方式

(1) //关闭页面--要弹出提示(IE6及以下不弹出提示)
    ClientScript.RegisterStartupScript(Page.GetType(), "", "<script language=javascript>window.opener=null;window.close();</script>");
(2)//不弹出提示直接关闭页面
    ClientScript.RegisterStartupScript(Page.GetType(), "", "<script language=javascript>window.opener=null;window.open('','_self');window.close();</script>");