private void 학과리스트ToolStripMenuItem_Click(object sender, EventArgs e) { bool bCheck = FormOverFlowCheck("MajorListForm"); if (!bCheck) { MaterialMessageBox.Show("이미열려있는 화면입니다.", "경고", MessageBoxButtons.OK); return; } MajorListForm frm = new MajorListForm(); frm.Show(); }