C# Definition:

enum DISP_CHANGE : int
{
    Successful = 0,
    Restart = 1,
    Failed = -1,
    BadMode = -2,
    NotUpdated = -3,
    BadFlags = -4,
    BadParam = -5,
    BadDualView = -6
}

VB Definition:

Enum DISP_CHANGE As Integer
    Successful= 0
    Restart = 1
    Failed = -1
    BadMode = -2
    NotUpdated = -3
    BadFlags = -4
    BadParam = -5
    BadDualView = -6
End Enum

Notes:

Used with ChangeDisplaySettings and ChangeDisplaySettingsEx