void calBeginEndSec()
{
string timeBegin = dataTable.Rows[0][0].ToString();
string timeEnd = dataTable.Rows[dataTable.Rows.Count - 1][0].ToString();
beginCentiSec = TheTool.calCentisecond(timeBegin);
endCentiSec = TheTool.calCentisecond(timeEnd);
}