public Form1() { InitializeComponent(); size = pbSimulation.Size; sim = new Simulation(); Data = new DataFileHelper("Simulation report.txt", sim); categoryComboBox.Items.Add("Random"); categoryComboBox.Items.Add(Category.A); categoryComboBox.Items.Add(Category.B); categoryComboBox.Items.Add(Category.C); categoryComboBox.Items.Add(Category.D); categoryComboBox.SelectedIndex = 0; tbRoomA.Text = "4"; tbRoomB.Text = "4"; tbRoomC.Text = "5"; tbRoomD.Text = "11"; tbBedA.Text = "2"; tbBedB.Text = "3"; tbBedC.Text = "1"; tbBedD.Text = "1"; }