How do I loop this data

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C#

I have set of data shown below (three columns)

empno date time
----- ---- ----
200175 01.01.2017 0801
200175 01.01.2017 1740
200178 01.01.2017 0745
200178 01.01.2017 1240
200178 01.01.2017 1320
200178 01.01.2017 1740
200178 02.01.2017 0750
200178 02.01.2017 1230
200178 02.01.2017 1310
200178 02.01.2017 1620

I want to loop first on selected date and then first employee's two records
when finished to next employee on same date likewise
for me second loop worked but first loop still at the start point
I want second loop also get updated

I new to c# so hope you all understand my mistakes

can anybody help me

Thanks

Ajith

What I have tried:

int x=0;
DateTime  dFDate =thistext1;
DateTime  dTDate =thistext2;

for (DateTime x = dFDate; x <= dTDate; x = x.AddDays(1))
{

    dDDate = x;
    duserdata = this.timeattDataSet.data;
    DataRow[] result1 = duserdata.Select("Date = #" + dDDate + "#");

    foreach (DataRow rowsdate in result1)
    {
      if (System.DateTime.Equals(rowsdate["Date"], dDDate))
      {
      string cEmpno = rowsdate["Token_no"].ToString();
      DataRow[] result2 = duserdata.Select("Date = #" + dDDate + "#" + " AND " + " Token_no = " + cEmpno) ;

      foreach (DataRow rowstime in result2)
      {

         // Here I calculate time period
         // this loop work fine

      }
    }
  }
}