HitTestValues

C# Definition:

enum HitTestValues
{
    HTERROR = -2,
    HTTRANSPARENT = -1,
    HTNOWHERE = 0,
    HTCLIENT = 1,
    HTCAPTION = 2,
    HTSYSMENU = 3,
    HTGROWBOX = 4,
    HTMENU = 5,
    HTHSCROLL = 6,
    HTVSCROLL = 7,
    HTMINBUTTON = 8,
    HTMAXBUTTON = 9,
    HTLEFT = 10,
    HTRIGHT = 11,
    HTTOP = 12,
    HTTOPLEFT = 13,
    HTTOPRIGHT = 14,
    HTBOTTOM = 15,
    HTBOTTOMLEFT = 16,
    HTBOTTOMRIGHT = 17,
    HTBORDER = 18,
    HTOBJECT = 19,
    HTCLOSE = 20,
    HTHELP = 21
}

enum HitTestValues
{
    /// <summary>
    /// In the border of a window that does not have a sizing border.
    /// </summary>
    HTBORDER = 18,

    /// <summary>
    /// In the lower-horizontal border of a resizable window (the user can click the mouse to resize the window vertically).
    /// </summary>
    HTBOTTOM = 15,

    /// <summary>
    /// In the lower-left corner of a border of a resizable window (the user can click the mouse to resize the window diagonally).
    /// </summary>
    HTBOTTOMLEFT = 16,

    /// <summary>
    /// In the lower-right corner of a border of a resizable window (the user can click the mouse to resize the window diagonally).
    /// </summary>
    HTBOTTOMRIGHT = 17,

    /// <summary>
    /// In a title bar.
    /// </summary>
    HTCAPTION = 2,

    /// <summary>
    /// In a client area.
    /// </summary>
    HTCLIENT = 1,

    /// <summary>
    /// In a Close button.
    /// </summary>
    HTCLOSE = 20,

    /// <summary>
    /// On the screen background or on a dividing line between windows (same as HTNOWHERE, except that the DefWindowProc function produces a system beep to indicate an error).
    /// </summary>
    HTERROR = -2,

    /// <summary>
    /// In a size box (same as HTSIZE).
    /// </summary>
    HTGROWBOX = 4,

    /// <summary>
    /// In a Help button.
    /// </summary>
    HTHELP = 21,

    /// <summary>
    /// In a horizontal scroll bar.
    /// </summary>
    HTHSCROLL = 6,

    /// <summary>
    /// In the left border of a resizable window (the user can click the mouse to resize the window horizontally).
    /// </summary>
    HTLEFT = 10,

    /// <summary>
    /// In a menu.
    /// </summary>
    HTMENU = 5,

    /// <summary>
    /// In a Maximize button.
    /// </summary>
    HTMAXBUTTON = 9,

    /// <summary>
    /// In a Minimize button.
    /// </summary>
    HTMINBUTTON = 8,

    /// <summary>
    /// On the screen background or on a dividing line between windows.
    /// </summary>
    HTNOWHERE = 0,

    /// <summary>
    /// Not implemented.
    /// </summary>
    /* HTOBJECT = 19, */

    /// <summary>
    /// In a Minimize button.
    /// </summary>
    HTREDUCE = HTMINBUTTON,

    /// <summary>
    /// In the right border of a resizable window (the user can click the mouse to resize the window horizontally).
    /// </summary>
    HTRIGHT = 11,

    /// <summary>
    /// In a size box (same as HTGROWBOX).
    /// </summary>
    HTSIZE = HTGROWBOX,

    /// <summary>
    /// In a window menu or in a Close button in a child window.
    /// </summary>
    HTSYSMENU = 3,

    /// <summary>
    /// In the upper-horizontal border of a window.
    /// </summary>
    HTTOP = 12,

    /// <summary>
    /// In the upper-left corner of a window border.
    /// </summary>
    HTTOPLEFT = 13,

    /// <summary>
    /// In the upper-right corner of a window border.
    /// </summary>
    HTTOPRIGHT = 14,

    /// <summary>
    /// In a window currently covered by another window in the same thread (the message will be sent to underlying windows in the same thread until one of them returns a code that is not HTTRANSPARENT).
    /// </summary>
    HTTRANSPARENT = -1,

    /// <summary>
    /// In the vertical scroll bar.
    /// </summary>
    HTVSCROLL = 7,

    /// <summary>
    /// In a Maximize button.
    /// </summary>
    HTZOOM = HTMAXBUTTON,
}

VB Definition:

Enum HitTestValues
     HTERROR = -2
     HTTRANSPARENT = -1
     HTNOWHERE = 0
     HTCLIENT = 1
     HTCAPTION = 2
     HTSYSMENU = 3
     HTGROWBOX = 4
     HTMENU = 5
     HTHSCROLL = 6
     HTVSCROLL = 7
     HTMINBUTTON = 8
     HTMAXBUTTON = 9
     HTLEFT = 10
     HTRIGHT = 11
     HTTOP = 12
     HTTOPLEFT = 13
     HTTOPRIGHT = 14
     HTBOTTOM = 15
     HTBOTTOMLEFT = 16
     HTBOTTOMRIGHT = 17
     HTBORDER = 18
     HTOBJECT = 19
     HTCLOSE = 20
     HTHELP = 21
End Enum