Work with plugins

        List<IEffectPlugin> plugs;

        private void LoadPlugins(string from)
        {
            if (!Directory.Exists(from))
            {
                AddEmptyItem(effectToolStripMenuItem);
                return;
            }
            var dlls = Directory.GetFiles(from, "*.dll").ToList().Where(s => Path.GetFileNameWithoutExtension(s) != "PlugAPI");
            plugs = new List<IEffectPlugin>();
            foreach (var s in dlls) LoadDll(s);
            if (effectToolStripMenuItem.DropDownItems.Count == 0) AddEmptyItem(effectToolStripMenuItem);
        }

        private void LoadDll(string dll)
        {
            Assembly a = Assembly.LoadFrom(dll);
            foreach (var t in a.GetTypes())
                if (t.IsClass && !t.IsAbstract && t.GetConstructors().ToList().Exists(c => c.GetParameters().Length == 0))
                {
                    try
                    {
                        object obj = Activator.CreateInstance(t);
                        if (obj is IEffectPlugin)
                        {
                            IEffectPlugin iplug = (IEffectPlugin)obj;
                            plugs.Add(iplug);
                            ToolStripMenuItem strip = new ToolStripMenuItem();
                            strip.Name = "effect_" + iplug.Name.Replace(" ", "");
                            strip.Text = iplug.Name;
                            strip.Click += effectClicked;

                            strip.DropDownItems.Add(new ToolStripMenuItem
                            {
                                Text = "Author: " + iplug.Author +
                                       "\nName: " + iplug.Name +
                                       "\nDescription: " + iplug.Description +
                                       "\nVersion: " + iplug.Version.ToString(),
                                Enabled = false
                            });

                            bool finded = false;
                            foreach (ToolStripItem ts in effectToolStripMenuItem.DropDownItems)
                                if (ts.Text.Equals(iplug.SubMenuName))
                                {
                                    (ts as ToolStripMenuItem).DropDownItems.Add(strip);
                                    finded = true;
                                    break;
                                }
                            if (!finded)
                            {
                                var ts = (ToolStripMenuItem)effectToolStripMenuItem.DropDownItems.Add(iplug.SubMenuName);
                                ts.DropDownItems.Add(strip);
                            }
                        }
                    }
                    catch { continue; }
                }
        }

        private void AddEmptyItem(ToolStripMenuItem toolit)
        {
            ToolStripMenuItem strip = new ToolStripMenuItem();
            strip.Name = "effect_empty";
            strip.Text = "Empty";
            strip.Enabled = false;
            toolit.DropDownItems.Add(strip);
        }

        private void effectClicked(object sender, EventArgs e)
        {
            string effName = (sender as ToolStripMenuItem).Text;
            var pl = plugs.Find(ip => ip.Name.Equals(effName));
            if (pl != null && pictureBox1.Image != null)
            {
                Image img = (Image)pictureBox1.Image.Clone(), img0 = null;
                this.Enabled = false;
                var setsForm = AutoGui.Gui.Create(pl.GetType());
                if (setsForm.ShowDialog() == DialogResult.OK)
                {
                    this.Text += " [Working...]";
                    img0 = (setsForm.Result as IEffectPlugin).ApplyEffect(img);
                    this.Text = this.Text.Replace(" [Working...]", "");

                    pictureBox1.Image = (Image)img0.Clone();
                    (listBox1.SelectedItem as FSFNameIC).Image = img0;
                }
                this.Enabled = true;
                /*using (var progressForm = new ShowProgress())
                {
                    th.Start();
                    progressForm.Left = this.Left + (this.Width - progressForm.Width) / 2;
                    progressForm.Top = this.Top + (this.Height - progressForm.Height) / 2;
                    progressForm.Show();
                    while (!pl.Completed) progressForm.ProgressValue = pl.ProgressValue;
                    progressForm.Hide();
                }*/
            }
        }