private void btnThemMoi_Click_1(object sender, EventArgs e)
        {
            KhoanChoVay_Session.themhoacsua = 1;// đang thêm
            frmThemHoacSuaKhoanChoVay nv = new frmThemHoacSuaKhoanChoVay();

            nv.ShowDialog();
            loadData();
        }
        private void btnSua_Click(object sender, EventArgs e)
        {
            KhoanChoVay_Session.themhoacsua = 0;// đang sửa
            int makv = Convert.ToInt32(gridView1.GetRowCellValue(gridView1.FocusedRowHandle, "id").ToString());

            KhoanChoVay_Session.ma = makv;
            frmThemHoacSuaKhoanChoVay nv = new frmThemHoacSuaKhoanChoVay();

            nv.ShowDialog();
            loadData();
        }