AboutBox.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Linq;
using System.Reflection;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Passwords
{
    partial class AboutBox : FormShadow
    {
        public AboutBox()
        {
            InitializeComponent();

            async void Exit() { for (Opacity = 1; Opacity > .0; Opacity -= .2) await Task.Delay(7); Close(); }
            CloseButton.Click += (s, a) => Exit();

            ToolTip t = new ToolTip();
            t.SetToolTip(CloseButton, "Закрыть");

            CloseButton.Click += (s, a) => this.Close();

            FormPaint(Color.FromArgb(44, 57, 67), Color.FromArgb(35, 44, 55));

            new List<Control> { FormName, HeaderPanel }.ForEach(x =>
            {
                x.MouseDown += (s, a) =>
                {
                    x.Capture = false;
                    Capture = false;
                    Message m = Message.Create(Handle, 0xA1, new IntPtr(2), IntPtr.Zero);
                    base.WndProc(ref m);
                };
            });

            this.Text = String.Format("О программе {0}", AssemblyTitle);
            this.labelProductName.Text = AssemblyProduct;
            this.labelVersion.Text = String.Format("Версия {0}", AssemblyVersion);
            this.labelCopyright.Text = AssemblyCopyright;
            this.LabelCompanyName.Text = AssemblyCompany;
            this.textBoxDescription.Text = AssemblyDescription;
        }

        #region Методы доступа к атрибутам сборки

        public string AssemblyTitle
        {
            get
            {
                object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyTitleAttribute), false);
                if (attributes.Length > 0)
                {
                    AssemblyTitleAttribute titleAttribute = (AssemblyTitleAttribute)attributes[0];
                    if (titleAttribute.Title != "")
                    {
                        return titleAttribute.Title;
                    }
                }
                return System.IO.Path.GetFileNameWithoutExtension(Assembly.GetExecutingAssembly().CodeBase);
            }
        }

        public string AssemblyVersion
        {
            get
            {
                return Assembly.GetExecutingAssembly().GetName().Version.ToString();
            }
        }

        public string AssemblyDescription
        {
            get
            {
                object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyDescriptionAttribute), false);
                if (attributes.Length == 0)
                {
                    return "";
                }
                return ((AssemblyDescriptionAttribute)attributes[0]).Description;
            }
        }

        public string AssemblyProduct
        {
            get
            {
                object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyProductAttribute), false);
                if (attributes.Length == 0)
                {
                    return "";
                }
                return ((AssemblyProductAttribute)attributes[0]).Product;
            }
        }

        public string AssemblyCopyright
        {
            get
            {
                object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCopyrightAttribute), false);
                if (attributes.Length == 0)
                {
                    return "";
                }
                return ((AssemblyCopyrightAttribute)attributes[0]).Copyright;
            }
        }

        public string AssemblyCompany
        {
            get
            {
                object[] attributes = Assembly.GetExecutingAssembly().GetCustomAttributes(typeof(AssemblyCompanyAttribute), false);
                if (attributes.Length == 0)
                {
                    return "";
                }
                return ((AssemblyCompanyAttribute)attributes[0]).Company;
            }
        }
        #endregion

        public void FormPaint(Color color1, Color color2)
        {
            void OnPaintEventHandler(object s, PaintEventArgs a)
            {
                if (ClientRectangle == Rectangle.Empty)
                    return;

                var lgb = new LinearGradientBrush(ClientRectangle, Color.Empty, Color.Empty, 90);
                var cblend = new ColorBlend { Colors = new[] { color1, color1, color2, color2 }, Positions = new[] { 0, 0.095f, 0.095f, 1 } };

                lgb.InterpolationColors = cblend;
                a.Graphics.FillRectangle(lgb, ClientRectangle);
            }

            Paint -= OnPaintEventHandler;
            Paint += OnPaintEventHandler;

            Invalidate();
        }

        async void AboutBox_Load(object sender, EventArgs e)
        {
            for (Opacity = 0; Opacity < .97; Opacity += 0.2) await Task.Delay(10);
        }

        void LabelCompanyName_Click(object sender, EventArgs e)
        {
            Process.Start("https://github.com/lauendewrau");
            this.Close();
        }
    }
}