C# Constants:

public const int WA_INACTIVE = 0;
public const int WA_ACTIVE = 1;
public const int WA_CLICKACTIVE = 2;

VB Constants:

'''<summary>Deactivated.</summary>
Public Const WA_INACTIVE As Integer = 0;
TODO

Notes:

public bool PreFilterMessage(ref Message m)
{
     if (m.Msg == Win32.WM_ACTIVATE && m.HWnd == f.Handle
     && Win32.LoWord(m.WParam.ToInt32()) == WA_INACTIVE) {
     ...
     }
}

'''<summary>
'''Activated by some method other than a mouse click (for example, by a call to
'''the SetActiveWindow function or by use of the keyboard interface to select the window).
'''</summary>
Public Const WA_ACTIVE As Integer = 1;

'''<summary>Activated by a mouse click.</summary>
Public Const WA_CLICKACTIVE As Integer = 2;

VB Enum:

''' <summary>Used in wParam of a WM_ACTIVATE message</summary>
Public Enum WA As Integer
   '''<summary>Deactivated.</summary>
   INACTIVE = 0

   '''<summary>
   '''Activated by some method other than a mouse click (for example, by a call to
   '''the SetActiveWindow function or by use of the keyboard interface to select the window).
   '''</summary>
   ACTIVE = 1

   '''<summary>Activated by a mouse click.</summary>
   CLICKACTIVE = 2
End Enum

Notes:

public bool PreFilterMessage(ref Message m)
{
     if (m.Msg == Win32.WM_ACTIVATE && m.HWnd == f.Handle
     && Win32.LoWord(m.WParam.ToInt32()) == WA_INACTIVE) {
     ...
     }
}

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