基本功能：

1：异步备份MySql数据库

2：如果备份成功，有耗时提示，并提供备份文件下载；如果备份失败，则提示错误信息。

设计页面截图：

 数据库备份的核心代码：

  string strConn = "server=localhost;database=AgrBankBox3;uid=root;pwd=888888;charset=gb2312;";

   
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            DeleteOldFile();
            try
            {
                lblMsg.Text = "";
                if (!TestConnection())
                {
                    return;
                }
                BackupData();

            }
            catch (Exception ex)
            {
                lblMsg.Text = ex.Message;
            }
        }
    }

    void mb_ProgressCompleted(object sender, MySqlBackupCompleteArg e)
    {
        if (e.CompletedType == MySqlBackupCompleteArg.CompleteType.Error)
        {
            Response.Write(e.ExceptionInfo.ToString());
        }
        else
        {
            Session["resultmsg"] = "耗时: " + e.TimeUsed.Hours + " 时 " + e.TimeUsed.Minutes + " 分 " + e.TimeUsed.Seconds + " 秒 " + e.TimeUsed.Milliseconds + " 毫秒.";
            Response.Redirect("BackupComplete.aspx");

        }
    }

    void DeleteOldFile()
    {
        string timeNow = DateTime.Now.AddMinutes(-15).ToString("yyyyMMddHHmmss");
        long iTimeNow = Convert.ToInt64(timeNow);
        string[] oldFiles = System.IO.Directory.GetFiles(Server.MapPath("~/dumpfiles"));
        foreach (string s in oldFiles)
        {
            if (!s.EndsWith("sql"))
            {
                continue;