private void صرفاصنافلموظفToolStripMenuItem_Click(object sender, EventArgs e) { if (category_to_employee == null) { category_to_employee = new category_to_employee(); category_to_employee.MdiParent = this; category_to_employee.FormClosed += new FormClosedEventHandler(category_to_employee_FormClosed); category_to_employee.Show(); } else { category.Activate(); } }
void category_to_employee_FormClosed(object sender, FormClosedEventArgs e) { //throw new NotImplementedException(); category_to_employee = null; }