private void HTDC_ToolStripMenuItem_Click(object sender, EventArgs e) { const string _c_frm_name = "Frm_HTDC"; if (CLS_FORM.Func_check_form_exists(_c_frm_name) != null) { CLS_FORM.LoadFormChild(CLS_FORM.Func_check_form_exists(_c_frm_name), this); } else { try { Frm_HTDC _Frm_HTDC = new Frm_HTDC(); CLS_FORM.LoadFormChild(_Frm_HTDC, this); } catch (Exception ex) { MessageBox.Show(ex.Message.ToString()); } } }