1、Response.Write
("<script>alert(‘查询语句执行出错！‘);window.location.href=http://www.mamicode.com/DisplayData.aspx</script>");

2、Page.RegisterStartupScript("msg", "<script>alert(‘查询语句执行出错！‘);window.location.href=http://www.mamicode.com/‘DisplayData.aspx‘</script>");
一般后台弹出提示框，都是用Page.RegisterStartupScript，不用Response.Write的

3、 ClientScript.RegisterStartupScript(this.GetType(), "", " <script lanuage=javascript> alert(‘‘);location.href=http://www.mamicode.com/‘‘;</script>");  

4、 System.Web.HttpContext.Current.Response.Write(String.Format("<script language=\"javascript\">alert(\"{0}\");window.location.replace(\"{1}\")</script>", strMessage, strRedirectUrl));

5、ScriptManager.RegisterStartupScript(this, this.GetType(), "u1", "alert(‘内容！‘)", true);

6、Page.ClientScript.RegisterStartupScript(this.GetType(), "d", "alert(‘请先登录！‘);location=‘../login.aspx‘;", true);

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asp.net 后台代码跳转页面前弹出提示框