Import to DataTable from Excel Sheet above 100k records

FileStream stream = File.Open(strTempPath, FileMode.Open, FileAccess.Read); 
if (Path.GetExtension(strTempPath).Equals(".xls")) 
    excelReader = ExcelReaderFactory.CreateBinaryReader(stream); // Reading from a binary Excel file ('97-2003 format; *.xls) 
else 
    excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream); //Reading from a OpenXml Excel file (2007 format; *.xlsx) 
excelReader.IsFirstRowAsColumnNames = true; 
//DataTable tblSchema = (new BusinessFacade.CommonSystem()).GetTableSchema(strTableName); 

DataTable result = new DataTable(); 
//result = tblSchema.Clone(); 
result = excelReader.AsDataSet().Tables[0]; 
excelReader.Close(); 
var dateColumns = from DataColumn d in result.Columns where d.DataType == typeof(DateTime) select d.Ordinal + 1; 
return result;