while ((line = reader.ReadLine()) != null)
        {
        list.Add(line); // Add to list.
        Console.WriteLine(line); // Write to console.
        }

while ((line = reader.ReadLine()) IsNot Nothing)

Do
    Dim line As String = reader.readLine()
    If line Is Nothing Then Exit Do
    Console.WriteLine(line)
Loop

line = reader.ReadLine()
    Do Until line Is Nothing
     Console.WriteLine(line)
     line = reader.ReadLine()
    Loop

Let line = reader.ReadLine()

line = reader.ReadLine()

Do
  line = reader.ReadLine()
  If line Is Nothing Then Exit Do
  Console.WriteLine(line)
Loop