弹出对话框

    /// <summary>
    /// 弹出对话框(确定后页面会错位)
    /// </summary>
    /// <param name="TxtMessage"></param>
    /// <returns></returns>
    public string MessageBox1(string TxtMessage)
    {
        string str;
        str = "<script language=javascript>alert('" + TxtMessage + "')</script>";
        return str;
    }

    /// <summary>
    /// 弹出对话框，不需要Response.Write(...)
    /// </summary>
    /// <param name="TxtMessage"></param>
    public void MessageBox(string TxtMessage)
    {
        Page page = (Page)HttpContext.Current.CurrentHandler;
        page.ClientScript.RegisterStartupScript(this.GetType(),"message","alert('" + TxtMessage + "')", true);
    }

       /// <summary>
       /// 弹出框并跳转到指定页面
        /// </summary>
        /// <param name="txtMessage">弹出框提示信息</param>
        /// <param name="url">要跳转到的地址</param>
        public void MessageBox(string txtMessage, string url)
        {
            Page page = (Page)HttpContext.Current.CurrentHandler;
            page.ClientScript.RegisterStartupScript(this.GetType(), "message", "alert('" + txtMessage + "');window.location='" + url + "'",true);
        }