DataGridView增加右键取消操作

if (e.Button == MouseButtons.Right && e.RowIndex > -)
            {
                dgvinfo.Rows[e.RowIndex].Selected = true;
                Point point = dgvinfo.PointToClient(Cursor.Position);
                this.menustrip.Show(dgvinfo, point);
                HookPlanTaskInfo hptinfo = dgvinfo.Rows[e.RowIndex].Tag as HookPlanTaskInfo;

            }