private static void FillColumnValues(DataTable table, XlsxReader.XlsxReader.Sheet sheet)
 {
     foreach (var firstRow in sheet.Rows.First())
     {
         table.Columns.Add(firstRow.Key, typeof(string));
     }
 }
 private static void FillRowValues(DataTable table, XlsxReader.XlsxReader.Sheet sheet)
 {
     foreach (var row in sheet.Rows)
     {
         var rowValues = new List <string>();
         foreach (var kv in row)
         {
             rowValues.Add(kv.Value);
         }
         table.Rows.Add(rowValues.ToArray <object>());
     }
 }