private void проверкаЗадачToolStripMenuItem_Click(object sender, EventArgs e)
 {
     taskWork tw = new taskWork(numPrepod, numTree);
     tw.Show();
 }
 private void button3_Click(object sender, EventArgs e)
 {
     taskWork tw = new taskWork(numPrepod, "1");
     tw.Show();
     this.Hide();
 }