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        enum INSTALLUILEVEL

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            INSTALLUILEVEL_NOCHANGE = 0,    // UI level is unchanged

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            INSTALLUILEVEL_DEFAULT  = 1,    // default UI is used

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            INSTALLUILEVEL_NONE     = 2,    // completely silent installation

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            INSTALLUILEVEL_BASIC    = 3,    // simple progress and error handling

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            INSTALLUILEVEL_REDUCED  = 4,    // authored UI, wizard dialogs suppressed

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            INSTALLUILEVEL_FULL     = 5,    // authored UI with wizards, progress, errors

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            INSTALLUILEVEL_ENDDIALOG    = 0x80, // display success/failure dialog at end of install

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            INSTALLUILEVEL_PROGRESSONLY = 0x40, // display only progress dialog

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            INSTALLUILEVEL_HIDECANCEL   = 0x20, // do not display the cancel button in basic UI

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            INSTALLUILEVEL_SOURCERESONLY = 0x100, // force display of source resolution even if quiet

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Documentation

[INSTALLUILEVEL] on MSDN

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or (and define enum INSTALLUILEVEL)

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static extern int MsiSetInternalUI(INSTALLUILEVEL dwUILevel, ref IntPtr phWnd);

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Private Function MsiSetInternalUI(dwUILevel As INSTALLUILEVEL, ByRef phWnd As IntPtr) As Integer

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public enum INSTALLUILEVEL

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    INSTALLUILEVEL_NOCHANGE = 0,    // UI level is unchanged

.

    INSTALLUILEVEL_DEFAULT  = 1,    // default UI is used

.

    INSTALLUILEVEL_NONE     = 2,    // completely silent installation

.

    INSTALLUILEVEL_BASIC    = 3,    // simple progress and error handling

.

    INSTALLUILEVEL_REDUCED  = 4,    // authored UI, wizard dialogs suppressed

.

    INSTALLUILEVEL_FULL     = 5,    // authored UI with wizards, progress, errors

.

    INSTALLUILEVEL_ENDDIALOG    = 0x80, // display success/failure dialog at end of install

.

    INSTALLUILEVEL_PROGRESSONLY = 0x40, // display only progress dialog

.

    INSTALLUILEVEL_HIDECANCEL   = 0x20, // do not display the cancel button in basic UI

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    INSTALLUILEVEL_SOURCERESONLY = 0x100, // force display of source resolution even if quiet

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MsiUtils.MsiSetInternalUI(MsiUtils.INSTALLUILEVEL.INSTALLUILEVEL_NONE , ref hwnd);