DataTable linq query iteration - linq

Question

I want to Enumerate Linq Query. Below i specified example.
EX:
DataTable _slidingDataTable = new DataTable("test");
for(int i=0; i<5;i++)
{
DataRow row = _slidingDataTable.NewRow();
startPosition = DateTime.Now;
for(int i=0; i<5;i++)
{
_slidingDataTable.Columns.Add("TransferTime");
row[columnName] = startPosition ;
_slidingDataTable.Columns.Add("TransferData");
row[columnName] = "Test"+i;
}
_slidingDataTable.Rows.Add(row);
}
var query1 = from myRow in _slidingDataTable.AsEnumerable()
where myRow.Field<DateTime>("TransferTime") == startPosition
select myRow;
This query output should be collection of rows. How to get collection row & iterate.

Answer 1

In your context, query1 is an EnumerableRowCollection<DataRow> because you used _slidingDataTable.AsEnumerable(), and you can iterate over it like so :
foreach (DataRow row in query1)
{
// Do stuff with that row
}

Answer 2

I'm giving you an example by which you can see it and it also includes sum in groupby.
var drdatedisp = from row in dtfullreport.AsEnumerable()
group row by row.Field<string>("Order_Date") into g
select new
{
Order_Date = g.Key,
totalQnty = g.Sum(a => a.Field<int>("Item_Quantity")),
totalTax = g.Sum(a => float.Parse(a.Field<decimal>("TAXAMT").ToString())),
totalAmt = g.Sum(a => float.Parse(a.Field<decimal>("VALAMT").ToString()))
};
DataTable dtdatedisp = new DataTable();
dtdatedisp.Columns.Add("Order_Date");
dtdatedisp.Columns.Add("Item_Quantity");
dtdatedisp.Columns.Add("TAXAMT");
dtdatedisp.Columns.Add("VALAMT");
dtdatedisp.Rows.Clear();
foreach (var g in drdatedisp)
{
DataRow newRow1 = dtdatedisp.NewRow();
newRow1[0] = g.Order_Date;
newRow1[1] = g.totalQnty;
newRow1[2] = String.Format("{0:0.00}", g.totalTax);
newRow1[3] = String.Format("{0:0.00}", g.totalAmt);
dtdatedisp.Rows.Add(newRow1);
}