To start using the FileHelpers Library you only need to add a reference in your project to the file: FileHelpers.dll. you can find it in the Release directory of the distribution. Tip: remember to left the FileHelpers.xml file to get Intellisense support.

Next you need to define a class that maps to the record in the source/detination file.
For this example we use a file with this format delimited by a ',':

1732,Juan Perez,435.00,11-05-2002 554,Pedro Gomez,12342.30,06-02-2004 112,Ramiro Politti,0.00,01-02-2000 924,Pablo Ramirez,3321.30,24-11-2002 ...............

So you must write this class:

C# [DelimitedRecord(",")] public class Customer { public int CustId; public string Name; public decimal Balance; [FieldConverter(ConverterKind.Date, "dd-MM-yyyy")] public DateTime AddedDate; }

VB.NET <DelimitedRecord(",")> _ Public Class Customer Public CustId As Integer Public Name As String Public Balance As Decimal <FieldConverter(ConverterKind.Date, "dd-MM-yyyy")> _ Public AddedDate As DateTime End Class

Later you need to create a FileHelperAsync and use it:

C# FileHelperAsyncEngine engine = new FileHelperAsyncEngine(typeof(Customer)); // Read engine.BeginReadFile("TestIn.txt"); // The engine is IEnumerable foreach(Customer cust in engine) { // your code here Console.WriteLine(cust.Name); } engine.Close(); // Write engine.BeginWriteFile("TestOut.txt"); foreach(Customer cust in arrayCustomers) { engine.WriteNext(cust); } engine.Close();

VB.NET Dim engine As New FileHelperAsyncEngine(GetType(Customer)) ' Read engine.BeginReadFile("TestIn.txt") ' The engine is IEnumerable For Each cust As Customer In engine) ' your code here Console.WriteLine(cust.Name) Next engine.Close() // Write engine.BeginWriteFile("TestOut.txt") For Each cust As Customer In arrayCustomers) engine.WriteNext(cust) Next engine.Close()