static extern uint MsiOpenDatabase(string szDatabasePath, IntPtr phPersist, out IntPtr phDatabase);

The sample application below demonstrates how to use MsiRecordSetString, MsiOpenDatabase, MsiCreateRecord, MsiCloseHandle, MsiDatabaseOpenView, MsiViewExecute, MsiDatabaseCommit, and MsiViewClose in C# to modify a property value in an MSI database. To run it, simply create a new Windows Console application and replace the code that Visual Studio gives you with the code below. You may have to modify the namespace name. The sample as-is requires a valid MSI database named SETUP.msi, with a property named PROPERTY1 in the Property table, to be located in C:\. You can of course change the path to your MSI database in the calls to ChangeMSIProperty() in Main() and use any existing property you wish.

    static extern int MsiOpenDatabase(string szDatabasePath, IntPtr phPersist, out IntPtr phDatabase);

    // Open mode constants for MsiOpenDatabase.

        WINDOWS_MESSAGE_CODES returnValue = (WINDOWS_MESSAGE_CODES)MsiOpenDatabase(path, persist, out msiHandle);

            throw new MsiInstallationSupportException(string.Format(CultureInfo.InvariantCulture, "MsiOpenDatabase returned error code {0}.", returnValue.ToString()));