/// <summary>
/// Opens the file for writing. First closes the file since it has already been opened for reading
/// </summary>
protected void InitializeForWriting()
{
Dispose(false);
DfsDLLWrapper.dfsFileEdit(_filename, out _headerPointer, out _filePointer);
_initializedForWriting = true;
for (int i = 0; i < NumberOfItems; i++)
{
var ip = DfsDLLWrapper.dfsItemD(_headerPointer, i + 1);
Items[i].ItemPointer = ip;
}
}