calculate row based on previous row in datatable in c#

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i have a datatable with columns : col1, col2, col3
suppose dataTable have below content

col1 | col2 | col3
100 | 0 | 100
100 | 0 | 100
0 | 150 | 150
0 | 200 | 200
200 | 0 | 200

i want change col3 based on (col3 from previous row) AND (col1 and col2 from current row) with below formula :

col3(current row)=col3(previous row)-(col1(current row)-col2(current row))

after this calculation result datatable must like below :

col1 | col2 | col3
100 | 0 | 100
100 | 0 | 200
0 | 150 | 50
0 | 200 | -150
200 | 0 | 50

thanks a lot

Posted 14-Nov-14 18:12pm

Esmaeil Ebrahimi

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jing567 · Accepted Answer · 2014-11-14T19:02:00

C#

 DataTable dtRawTable = new DataTable();
                DataTable dtFinalised=new DataTable();
                dtFinalised.Columns.Add("Col1",typeof(int));
                dtFinalised.Columns.Add("Col2",typeof(int));
                dtFinalised.Columns.Add("Col3",typeof(int));

for (int index = 0; index <= dtRawTable.Rows.Count; index++)
  {
     DataRow dr = dtFinalised.NewRow();
     if(index%2==0)
     {
      //  col3(current row)=col3(previous row)-(col1(current row)-col2(current row))
     // Please change the formaula acc to you concept
 dr["Col1"] = (Convert.ToInt32(dtRawTable.Rows[index-1]["Col1"].ToString())-(Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString())-Convert.ToInt32(dtRawTable.Rows[index-1]["Col2"].ToString())));
dr["Col2"] = (Convert.ToInt32(dtRawTable.Rows[index - 1]["Col2"].ToString()) - (Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString()) - Convert.ToInt32(dtRawTable.Rows[index - 1]["Col2"].ToString())));
  dr["Col3"] = (Convert.ToInt32(dtRawTable.Rows[index - 1]["Col3"].ToString()) - (Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString()) - Convert.ToInt32(dtRawTable.Rows[index - 1]["Col2"].ToString())));
       }
 else
   {
      dr["Col1"] =Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString());
     dr["Col1"] = Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString());
     dr["Col1"] = Convert.ToInt32(dtRawTable.Rows[index]["Col1"].ToString());
   }
   dtFinalised.Rows.Add(dr);
   dtFinalised.AcceptChanges();


 }

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