private void löschenToolStripMenuItem_Click(object sender, EventArgs e) { string name = treeMain.SelectedNode.Text; string typeOfObject = getTypeOfNode(treeMain.SelectedNode); if (typeOfObject.Equals("interpret")) { Interpret i = new Interpret(name, "", ""); i.delete(name); } else if (typeOfObject.Equals("album")) { Album a = new Album(name, "", "", "", ""); a.delete(name); } prepareTree(); }