reading flat file of fixed length and write into the data base

[CoolG1]

I am working as a web developer , doing project in vb.net in that by using c, they have taken the data from machine and store it as a flat file with .L extension into the directory, Now i have to read the flat file of fixed length from this directory and store it into the database table,
The table have the fields like this
datcallingDateTime as Date
LgTransTime as long
int TkNo as integer
intServiceNo as integer
intCounterNo as integer
intApplicationNo as integer .....
Since it is a flatfile i cannot see the content how it is inside,the only information i got is ,it is of fixed length,

please help in regarding reading the flat files.

[Phil Weber]

' Imports System.IO
' Imports System.Runtime.InteropServices

Private Structure RecordType
    Public datCallingDateTime As Date
    Public lngTransTime As Long
    Public intTkNo As Integer
    Public intServiceNo As Integer
    Public intCounterNo As Integer
    Public intApplicationNo As Integer
End Structure

Dim handle As GCHandle
Dim ptr As IntPtr

Dim Record As RecordType
Dim Buffer(Len(Record) - 1) As Byte
Dim theFile As New FileStream("d:\path\filename.L", FileMode.Open, FileAccess.Read)

Do Until theFile.Position >= theFile.Length
    ' Read one record into Buffer array
    theFile.Read(Buffer, 0, Buffer.Length)
    ' Copy Buffer into Record structure
    handle = GCHandle.Alloc(Buffer, GCHandleType.Pinned)
    ptr = handle.AddrOfPinnedObject()
    Record = DirectCast(Marshal.PtrToStructure(ptr, GetType(RecordType)), RecordType)
    handle.Free()

    ' -- Insert values of Record structure into database 

Loop
theFile.Close()