Uninstall a application during installation not working

Question

I am developing WPF application in C#. Currently my msi install the current application in machine.I need to uninstall two supporting application of existing version during

Answer 1

sorry to be the one with the bad news... but:

when installing / uninstalling a program from any modern windows-based machine - there is no way to start more then 1 instance of the installation wizard (in short: the msiExec)

that is why it works great on other parts of your project - because no calls for the msiExec are made at those points

and now for the good news: you can send the unistall command with a delay, or even better - start a timer that asks every X seconds if the installation is over. when the installer will complete, you will be able to make the unistall commands. something like this:

        timer = new System.Timers.Timer(2 * 1000) { Enabled = true };

        timer.Elapsed += delegate(object sender, System.Timers.ElapsedEventArgs e)
        {

        }

        timer.Start(); // finally, call the timer