asp.net的弹出消息框！

Response.Write ("<script>alert(""你在没有输入前不可以做以下操作!"")</script>");
public void Pop(string Msg)
        {
            StringBuilder ghq=new StringBuilder();
            ghq.Append("<script language=javascript>"n");
            ghq.Append("alert("+"'"+Msg+"'"+");" + ""n");
            ghq.Append("</script>");
            Page.RegisterStartupScript("",ghq.ToString());
        }