Grouping DataTable raw records with LINQ

GroupingWithLinq.cs

var DistinctGroupedColumns = dt.AsEnumerable().GroupBy(x => x.Field<Int32>("COLUMNONE")).Distinct().ToList();
foreach (var date in DistinctGroupedColumns)
			{
				//For each distinct record, get the associated list of records
				var associatedListOfRecords = (from alofrec in dt.AsEnumerable() where alofrec.Field<Int32>("COLUMNONE").Date.ToString() == date.Key.ToString()
						     select alofrec).ToList();
        int i = 0;
				
				//The foreach below gets associated records per grouped group.
				foreach (var timePart in associatedListOfRecords)
				{
					var COLUMNONE = Convert.ToDateTime(timePart.Field<DateTime>("CDateTime")).Date.ToString("dd/mm/yyyy");
					var COLUMNTWO = Convert.ToDateTime(timePart.Field<DateTime>("CDateTime")).ToString("HH:mm");
					var COLUMNTHREE = timePart.Field<String>("PhoneNumber").ToString();
					var COLUMNFOUR = timePart.Field<String>("AccountNumber").ToString();
					var COLUMNFIVE = timePart.Field<String>("HouseNumber").ToString();

					// Do something with the column values, like print an HTML grid in Razor View, or send an SMTP email with those values.
					// i is an additional variable, just in case, to keep record count for each group

					i = i + 1;
				}
			}