弹出对话框并跳转页面

Response.Write("<script language=/"javascript/">alert('Save'); window.location.href='"+pageurl+"';</script>");

ScriptManager.RegisterStartupScript(this, this.GetType(), "s1", "alert('文件服务器中不存在此文件，请联系系统管理员！');window.location.href='" + pageurl + "';", true);

通过修改有两种解决方法一种：利用脚步跳转

Response.Write("<script>alert('dsafasdf');<script>");

Response.Write("<script>window.location.href='webform2.aspx'<script>");