C#

WinForm

GDI+

WPF(Windows Presentation Foundation)

System.Windows.Forms.Application // static

.Run()

System.Windows.Forms.Control -> System.ComponentModel.Component

System.Windows.Forms.ScrollableControl -> System.Windows.Forms.Control

System.Windows.Forms.ContainerControl -> System.Windows.Forms.ScrollableControl

System.Windows.Forms.Form -> System.Windows.Forms.ContainerControl

using System;

using System.Drawing;

using System.Windows.Forms;

class MDHForm : Form

{

    public static void Main()

    {

        MDHForm MyForm = new MDHForm();

        MyForm.Text = "..";

        MyForm.Width = 400;

        MyForm.Height = 200;

        MyForm.FormBorderStyle = FormBorderStyle.FixedSingle;

        MyForm.MaximizeBox = false;

        MyForm.BackColor = System.Drawing.Color.Blue;

        MyForm.Opacity = 0.8;

        Application.Run(MyForm);

    }

}