private void biImport_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            if (this.openFileDialog1.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            AccountsData data = new AccountsData();

            data.FileName = this.saveFileDialog1.FileName;
            data.RestoreFromXml();
            int count = 0;

            foreach (AccountInfo account in data.Accounts)
            {
                if (Keys.FirstOrDefault(a => a.ApiKey == account.ApiKey) != null)
                {
                    continue;
                }
                count++;
                account.Exchange = Exchange.Registered.FirstOrDefault(ee => ee.Type == account.Type);
                Keys.Add(account);
            }
            if (count < data.Accounts.Count)
            {
                XtraMessageBox.Show("Api Keys successfully imported. However some Api Keys skipped, because they are already added.");
            }
            else
            {
                XtraMessageBox.Show("All Api Keys successfully imported.");
            }
        }
        private void btExportToFile_ItemClick(object sender, DevExpress.XtraBars.ItemClickEventArgs e)
        {
            if (this.saveFileDialog1.ShowDialog() != DialogResult.OK)
            {
                return;
            }
            AccountsData data = new AccountsData();

            data.Accounts.AddRange(Keys);
            data.FileName = this.saveFileDialog1.FileName;
            data.SaveToXml();
            System.Diagnostics.Process.Start(Path.GetDirectoryName(data.FileName));
        }