private void MainWindow_Load(object sender, EventArgs e)
{
if (Properties.Settings.Default.Guid == null)
{
Properties.Settings.Default.Guid = Guid.NewGuid().ToString();
DatabaseOperations.AddNewUserGuid(Properties.Settings.Default.Guid);
}
else
{
_isSaveNeeded = DatabaseValidation.CheckUserGuid(Properties.Settings.Default.Guid);
downloadHistoryDGV.DataSource = DatabaseOperations.FillDataGridView(Properties.Settings.Default.Guid);
}
MessageBox.Show(Properties.Settings.Default.Guid);
}