Sure thing! But note, that this C# is just the interface, and it also requires you to install **GTK** to your machine. Here is the code that loads this interface:

```cs
using Gtk;

public class MainWindow : Gtk.Window
{
    public MainWindow() : base("To-Do List")
    {
        // Set default size of window
        SetDefaultSize(600, 400);

        // Create a box to hold the grid and the task list
        Box box = new Box(Orientation.Vertical, 10);

        // Create a grid to hold the task entry and due date entry
        Grid grid = new Grid();
        grid.ColumnHomogeneous = true;
        grid.RowSpacing = 6;
        grid.ColumnSpacing = 6;
        grid.MarginStart = 10;
        grid.MarginEnd = 10;
        grid.MarginTop = 10;
        grid.MarginBottom = 10;

        // Add task label and entry to grid
        Label taskLabel = new Label("Task:");
        grid.Attach(taskLabel, 0, 0, 1, 1);
        Entry taskEntry = new Entry();
        taskEntry.Name = "task_entry";
        grid.Attach(taskEntry, 1, 0, 1, 1);

        // Add due date label and entry to grid
        Label dueDateLabel = new Label("Due Date:");
        grid.Attach(dueDateLabel, 0, 1, 1, 1);
        Entry dueDateEntry = new Entry();
        dueDateEntry.Name = "due_date_entry";
        grid.Attach(dueDateEntry, 1, 1, 1, 1);

        // Add "Add Task" button to grid
        Button addButton = new Button("Add Task");
        addButton.Expand = false;
        addButton.Halign = Align.End;
        addButton.Valign = Align.End;
        addButton.Clicked += OnAddTaskButtonClicked;
        grid.Attach(addButton, 1, 2, 1, 1);

        // Add grid to box
        box.Add(grid);

        // Create a scrolled window to hold the task list
        ScrolledWindow scrolledWindow = new ScrolledWindow();
        scrolledWindow.HscrollbarPolicy = PolicyType.Never;
        scrolledWindow.VscrollbarPolicy = PolicyType.Always;

        // Create a list box to hold the tasks
        ListBox listBox = new ListBox();
        listBox.Name = "task_list";

        // Add list box to scrolled window
        scrolledWindow.Add(listBox);

        // Add scrolled window to box
        box.Add(scrolledWindow);

        // Add box to window
        Add(box);

        // Show all widgets
        ShowAll();
    }

    private void OnAddTaskButtonClicked(object sender, EventArgs args)
    {
        // TODO: Implement task adding functionality
    }

    public static void Main(string[] args)
    {
        Application.Init();

        MainWindow mainWindow = new MainWindow();
        mainWindow.DeleteEvent += delegate { Application.Quit(); };
        mainWindow.Show();

        Application.Run();
    }
}
```

Some things to note: I commented the code, so you can understand how something works. I added a "TODO", so you will have to implement the functionality of adding tasks. Also, note that this is just a **beginning point**, and is **not** production-ready.
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