如何在C＃mysql备份数据库中授予权限

Question

错误消息：访问路径＆＃39; C：\ backupSALES.sql＆＃39;被拒绝。

这是我的代码：

    private void BackupSALES()
    {
        string constring = "server=localhost;user=root;pwd=1234;database=sales;";
        string file = "C:\\backupSALES.sql";
        using (MySqlConnection conn = new MySqlConnection(constring))
        {
            using (MySqlCommand cmd = new MySqlCommand())
            {
                using (MySqlBackup mb = new MySqlBackup(cmd))
                {
                    cmd.Connection = conn;
                    conn.Open();
                    mb.ExportToFile(file); //PROMTS AN ERROR
                    conn.Close();
                }
            }
        }
    }