This tutorial is about how to start with an Empty project , use packages , add a class and finish the project.
First you need to start with an Empty Project from the main menu : File – New – Project .
Select the Windows Desktop – Empty Project add the name of your project.
I named my project TerminalGui_001 because I used a package from nuget named Terminal.Gui.
Use from menu the Tool – Nuget Package Manager – Package Manage – Console to open the command shell for nuget packages.
Into this command shell – is into the bottom area of Visual Studio , type this:

PowerShell
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PM> Install-Package Terminal.Gui

This will install the Terminal.Gui package into your project.
Now you need to add your C# class .
Use right click on your project tree structure and select Add – New Item… or keys Ctrl+Shift+A or just search the menu Project.
This will open a dialog and you need to select Class and name your class .
I named my class Ex001.
Now you can use the features of package named Terminal.Gui.
About this package you can read more here.
My example is simple and use some controls to understand how is working.
Let’s see the source code:

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Terminal.Gui;
 
namespace TerminalGui_001
{
    class Ex001
    {
        static void Main()
        {
            Application.Init();
            var top = Application.Top;
 
            // Creates the top-level window to show
            var win = new Window(new Rect(0, 1, top.Frame.Width, top.Frame.Height - 1), "Ex001");
            top.Add(win);
 
            // Creates a menubar, the item "New" has a help menu.
            var menu = new MenuBar(new MenuBarItem[] {
            new MenuBarItem ("_File", new MenuItem [] {
                new MenuItem ("_New", "New file", NewFile),
                new MenuItem ("_Open", "Open file", OpenFile),
                new MenuItem ("_Close", "", () => Close ()),
                new MenuItem ("_Quit", "", () => { if (Quit ()) top.Running = false; })
            }),
            new MenuBarItem ("_Edit", new MenuItem [] {
                new MenuItem ("_Copy", "", null),
                new MenuItem ("C_ut", "", null),
                new MenuItem ("_Paste", "", null)
            })
        });
            top.Add(menu);
 
            // Add some controls
            win.Add(
                    new Label(3, 2, "Normal edit box: "),
                    new TextField(14, 2, 40, ""),
                    new Label(3, 4, "Password edit box: "),
                    new TextField(14, 4, 40, "") { Secret = true },
                    new CheckBox(3, 6, "CheckBox"),
                    new RadioGroup(3, 8, new[] { "check 1", "check 2", "check 3" }),
                    new Button(3, 14, "Button Ok"),
                    new Button(10, 14, "Button Cancel"),
                    new Label(3, 18, "This is a label "));
 
            Application.Run();
        }
 
        private static bool Quit()
        {
            var mess_quit = MessageBox.Query(50, 7, "Quit Ex001", "Are you sure !?", "Yes", "No");
            return mess_quit == 0;
        }
 
        private static void Close()
        {
            MessageBox.ErrorQuery(50, 5, "Error", "... nothing to close", "Yes!");
        }
 
        public static Label my_dialog_label;
        private static void NewFile()
        {
            var my_dialog = new Dialog(
                "New File", 50, 20,
                new Button("Ok", is_default: true) { Clicked = () => { Application.RequestStop(); } },
                new Button("Cancel") { Clicked = () => { Application.RequestStop(); } });
            my_dialog_label = new Label(1, 1, "This is a label !");
            my_dialog.Add(my_dialog_label);
            Application.Run(my_dialog);
            
        }
        public static void OpenFile()
        {
            var my_open_dialog = new OpenDialog("Open", "Open a file");
            Application.Run(my_open_dialog);
        }
    }
}

Use Build – Build Solution or Ctrl+Shift+B then press the Start button to run it.
Let’s see the result of this source code:

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