Winform

Form1.cs:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
            this.ShowInTaskbar = false;
        }
        protected override CreateParams CreateParams
        {
            get
            {
                var cp = base.CreateParams;
                cp.ExStyle |= 0x80;  // Turn on WS_EX_TOOLWINDOW
                return cp;
            }
        }
    }
}

Console (Ẩn ra khỏi Processes trong Task Manager)

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading.Tasks;

namespace Hidden
{
    internal class Program
    {
        [DllImport("kernel32.dll")]
        static extern IntPtr GetConsoleWindow();

        [DllImport("user32.dll")]
        static extern bool ShowWindow(IntPtr hWnd, int nCmdShow);

        const int SW_HIDE = 0;
        static void Main(string[] args)
        {
            Console.Write("Margaret Wang");
            var handle = GetConsoleWindow();
            // Hide
            ShowWindow(handle, SW_HIDE);
            Console.ReadKey();
        }
    }
}