private void btnLoadPlugin_Click(object sender, EventArgs e) { if (openFileDialog.ShowDialog() == DialogResult.Cancel) { return; } if (openFileDialog.FileName.EndsWith(".dll")) { PluginsManager.LoadPlugin(openFileDialog.FileName); comboBoxPlugin.DataSource = PluginsManager.GetPlugins(); } else { MessageBox.Show("Plugin file should be .dll file"); } }