enum INSTALLLOGATTRIBUTES // flag attributes for MsiEnableLog

            INSTALLLOGATTRIBUTES_APPEND = (1 << 0),

            INSTALLLOGATTRIBUTES_FLUSHEACHLINE = (1 << 1),

public static extern UInt32 MsiEnableLog(INSTALLLOGMODE dwLogMode, string szLogFile, INSTALLLOGATTRIBUTES dwLogAttributes);

        public enum INSTALLLOGATTRIBUTES // flag attributes for MsiEnableLog

            INSTALLLOGATTRIBUTES_APPEND = (1 << 0),

            INSTALLLOGATTRIBUTES_FLUSHEACHLINE = (1 << 1),

                             INSTALLLOGATTRIBUTES.INSTALLLOGATTRIBUTES_FLUSHEACHLINE);

    MsiEnableLog(INSTALLLOGMODE.INSTALLLOGMODE_VERBOSE, "C:\\temp\\log.log", INSTALLLOGATTRIBUTES.INSTALLLOGATTRIBUTES_APPEND);