Winforms - Assignment To Apparently Nonexistent Variables In .NET?

I have some VB.NET (which I don't normally deal with) code which must be converted to C# (which I normally do).The code happens to be in a Windows Forms app. I notice a couple of places such as:

Public Sub New()
ParentWindow = Me

where there is no ParentWindow variable defined, and it doesn't seem to be inherited here:

Public Class MainWindow
Inherits System.Windows.Forms.Form
Private Shared parentWindow As MainWindow
'....

(Though note that there is a similar variable with a lower-case first letter.)

and this:

DocumentCount = 0;

where, again, there is no corresponding variable definition and a straight conversion to C# Windows Forms indicates that there is no such member in the parent class.Am I missing an import somewhere, or is this a feature peculiar to VB.NET that doesn't translate directly to C#?