C#

public class Garage : 
{

		
		



public BindingList<DrawerData> Drawer = new BindingList<DrawerData>
		{
			new DrawerData(),
			new DrawerData()
			
		};
}
	
public class DrawerData : INotifyPropertyChanged
{
	private decimal _NumberOfTools;
	public event PropertyChangedEventHandler PropertyChanged;

	public decimal NumberOfTools
		{
			get { return _NumberOfTools; }
			set {
				if (_NumberOfTools != value)
				{
					_NumberOfTools = value;

					OnPropertyChanged("NumberOfTools");
				}
			}
		}

	public event PropertyChangedEventHandler PropertyChanged;
		public void OnPropertyChanged([CallerMemberName] string PropertyName = "")
		{
			
			PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(PropertyName));
			
		}

}

public partial class UcDrawer : UserControl, INotifyPropertyChanged
{

	private readonly Garage _Garage;
	private readonly int Drw
	BindingSource bindingSource = new BindingSource();

	public event PropertyChangedEventHandler PropertyChanged;

	public UcDrawer(int drw,Garage garage)
		{
			_Garage = garage;
			Drw = drw;

			bindingSource.DataSource = _Garage.Drawer[Drw];
			
		}

	private void UcDrawer_Load(object sender, EventArgs e)
		{
			UpDnSettingsNumberOfTools.DataBindings.Add(new Binding("Value", bindingSource, "NumberOfTools", true, DataSourceUpdateMode.OnPropertyChanged));
			
		}

}

public partial class FrmGarage : Form
	{
		private readonly int Drw;
		private readonly Garage _Garage;

		public FrmGarage(int drw, Garage garage )
		{
			InitializeComponent();
			Drw = drw;
			_Garage = garage;
		}

		private void FrmGarage_Load(object sender, EventArgs e)
		{
			for (int i = 0; i < ch; i++)
			{
				AddTab(i + 1);
			}
		}

		private void AddTab(int ChNum)
		{
			UcDrawer ucDrawer = new UcDrawer(Drw, _Garage) { Dock = DockStyle.Fill };
			TabPage myTabPage = new TabPage();
			myTabPage.Controls.Add(ucDrawer);
			GarageTabControl.TabPages.Add(myTabPage);

			myTabPage.Name = "Drawer" + Drw;
			myTabPage.Text = "Drawer " + Drw;
		}

		
	}
}

public partial class Form1 : Form
	{
		public Garage garage;
		readonly private FrmGarage FrmGarage_vrb;
		private Form ActiveMainForm = null;

		public Form1()
		{
			InitializeComponent();
			garage = new Garage();
			

			FrmGarage_vrb = new FrmGarage(2, garage)    { Dock = DockStyle.Fill, TopLevel = false, TopMost = true };
		}
		

		//Form loader code when one of the side buttons is clicked

		private void MainButtonListClickAction(Button buttonClicked, Form formActivated)
			{
				pnlNav.Height = buttonClicked.Height;
				pnlNav.Top = buttonClicked.Top;
				this.pnlFormLoader.Controls.Clear();
				this.pnlFormLoader.Controls.Add(formActivated);
				formActivated.Show();
				ActiveMainForm = formActivated;
			}


		public void BtnOverride_Click(object sender, EventArgs e)
			{
				MainButtonListClickAction(BtnGarage, FrmGarage);
			}


		//When the New button is pressed,  a defaults file is loaded

		private void BtnMainNew_Click(object sender, EventArgs e)
		{
			

			XmlSerializer serializer = new XmlSerializer(typeof(BindingList<DrawerData>));
			XmlReader reader = XmlReader.Create("defaults.xml");
			garage.Drawer = (BindingList<DrawerData>)serializer.Deserialize(reader);
			
			reader.Close();
			
		
		}

How C# handles binary files?

I already know how to read binary files with the "ReadAllText" command.