class Row
    {
        public int Id;
        public DateTime EventDate;
		
    }
	
static DataTable GetDataTable(Row[] rows)
        {
            DataTable table = new DataTable(); 
            table.Columns.Add("Id", typeof(Int32)); 
            table.Columns.Add("EventDate",typeof(DateTime));
            foreach (Row row in rows)
            {
                table.Rows.Add(row.Id, row.EventDate);
            }
            return (table);
        }	
		
		
static DateTime Trim(DateTime date, long roundTicks)
    {
        return new DateTime(date.Ticks - date.Ticks % roundTicks);
    }		
		
void Main()
{
			Row[] arrayRows = Enumerable.Range(1, 1000).Select(i => new Row() {Id = i, EventDate = DateTime.Now.AddMinutes((double)i)} ).ToArray();
					 								 

            DataTable dt = GetDataTable(arrayRows);	

			dt.Dump();
			
			var query = dt.AsEnumerable().Where(row => new DateTime(row.Field<DateTime>("EventDate").Ticks - row.Field<DateTime>("EventDate").Ticks % TimeSpan.TicksPerDay) == new DateTime(2015, 3, 24));

			// this.logVisitBindingSource = query.AsDataView();
				
}