private void saveToolStripMenuItem_Click(object sender, EventArgs e) { Form activeChild = this.ActiveMdiChild; Object o = e as Object; //e is an eventarg //it is also an Object //me is a mouseventarg //which is also an Object MouseEventArgs me = e as MouseEventArgs; if (activeChild != null) { if (activeChild.GetType() == typeof(Form1)) { Form1 f = activeChild as Form1; f.NewClick(); } } }