guys!

I have a GUI Project in C#, where I add figures, par example: Rectangle, Square etc.
I have to Serialize them in .bin and then Deserialize them and open the figures once again in the GUI . I use [Serializable] and I can save them successfully from the GUI when I start the Application, but when I try to open them in GUI, nothing happens. There are no errors, but nothing shows up.

Here is the Deserialize Code:
MainForm.cs

 OpenFileDialog openFileDialog = new OpenFileDialog
 {
     Filter = "Binary files (*.bin)|*.bin|All files (*.*)|*.*",
     DefaultExt = "bin"
 };

 if (openFileDialog.ShowDialog() == DialogResult.OK)
 {
     try
     {
         List<Shape> loadedShapes = SerializationHelper.LoadFromFile(openFileDialog.FileName);

         if (loadedShapes != null)
         {
             ShapeList.Clear();
             ShapeList.AddRange(loadedShapes);

             statusBar.Items[0].Text = "Last action: Open";
             viewPort.Invalidate(); // Refresh the screen to display the new shapes
         }
         else
         {
             MessageBox.Show("Failed to load shapes from file.", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
         }
     }
     catch (Exception ex)
     {
         MessageBox.Show($"Error while loading file: {ex.Message}", "Error", MessageBoxButtons.OK, MessageBoxIcon.Error);
     }
 }

and the Method: LoadFromFile:

public static List<Shape> LoadFromFile(string fileName)
{
        if (string.IsNullOrEmpty(fileName))
            throw new ArgumentNullException(nameof(fileName));

        try
        {
            using (FileStream fs = new FileStream(fileName, FileMode.Open))
            {
                BinaryFormatter formatter = new BinaryFormatter();
                var shapes = (List<Shape>)formatter.Deserialize(fs);
                Console.WriteLine($"Loaded {shapes.Count} shapes from {fileName}");
                return shapes;
            }
        }
        catch (Exception ex)
        {
            Console.WriteLine("Error while loading: " + ex.Message);
            return null;
        }
    
}

I don’t know what I am doing wrong, tried with GPT but it says the code is OK.