private void spliteBlock_RunWork(object sender, DoWorkEventArgs e)
{
var bw = sender as BackgroundWorker;
BlockMaker bm = new BlockMaker(txtCityName.Text, decimal.Parse(txtCoordinateOffset.Text));
bm.NewRound += Bm_NewRound;
var blocks = bm.SplitBlock();
e.Result = blocks;
}
