private void btn_Them_DM_Click(object sender, EventArgs e)
 {
     Dialog.DAL_DanhMuc dAL_Danh = new Dialog.DAL_DanhMuc();
     dAL_Danh.ShowDialog();
     try
     {
         dgv_DanhMuc.DataSource = Entities_Data.DanhMuc_Data.Get_DanhMucList();
     }
     catch (Exception) { }
 }
        private void Sua_DM()
        {
            if (Get_IdDM() != null)
            {
                Dialog.DAL_DanhMuc hangSX = new Dialog.DAL_DanhMuc(int.Parse(Get_IdDM()));
                hangSX.ShowDialog();

                try
                {
                    dgv_DanhMuc.DataSource = Entities_Data.DanhMuc_Data.Get_DanhMucList();
                }
                catch (Exception) { }
            }
        }