private void buttonImport_Click(object sender, EventArgs e)
        {
            btnCheckin.Enabled  = true;
            btnDropoff.Enabled  = true;
            btnConveyor.Enabled = true;
            btnSecurity.Enabled = true;
            string filePath = "";

            if (!this.ImportExportHelper(ref filePath, ref readAndWrite))
            {
                MessageBox.Show("Choose file");
                return;
            }
            this._grid = readAndWrite.ReadData(filePath);
            this._simulationSettings.FrontNodes = _grid.CheckTheConnection();
            this.FindDropOffsAfterGridImport(_simulationSettings.FrontNodes);
            this.animationBox.Invalidate();
        }