Files & Directories

There are five classes in the System.IO namespace that are very useful:
Directory - Contains shared methods that let you enumerate and manipulate directories
DirectoryInfo - Represents an individual directory and exposes methods to query its attributes and manipulate them
File - Contains shared methods that let you enumerate and manipulate files
FileInfo - Represent an individual file and exposes methods to query its attributes and manipulate them
Path - Contains shared methods that let you manipulate path information
This namespace also provides classes to allow synchronous and asynchronous reading from and writing to data strreams and files.
FileStream -
StreamReader -
StreamWriter -

System.IO.FileSystemWatcher 

With System.IO.DriveInfo 
   .AvailableFreeSpace 
   .RootDirectory 
   .TotalSize 
   .TotalFreeSize 
End WIth 

UNC - \\system\share\directory 

CopyDirectory(   , showUI) 
showUI = UIOption.AllDialogs | OnlyErrorDialogs 

With System.Environment.SystemDirectory 
   .ApplicationData 
   .ProgramFiles 
   .Favourties 
   .System 
End With 

System.Linq - Standard Query Operators

var folders = System.IO.Directory.GetDirectories( 
   @"C:\").Where(d => d.Length > 5).OrderBy(d => d.Length); 
foreach (string folder in folders) 
{ 
   System.Windows.Forms.MessageBox.Show(folder); 
} 

System.Linq - Query Expression Syntax

var folders = 
   from d in System.IO.Directory.GetDirectories(@"C:\") 
   where d.Length > 5 
   orderby d.Length 
   select d; 
foreach (string folder in folders) 
{ 
   System.Windows.Forms.MessageBox.Show(folder); 
} 

VB.Net

VB.Net and VBA Migration

Data Pipeline

Often abbreviated to DPL.
Real time multi-threading
link - learn.microsoft.com/en-us/dotnet/standard/io/pipelines
link - learn.microsoft.com/en-us/dotnet/standard/parallel-programming/walkthrough-creating-a-dataflow-pipeline