How to create condition during uninstall

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C#

C#4.0

Dear Sir
i have faced two problem which i can not solve.I want to stop uninstalling my application from control panel when the app is running.
i add the following code but it seems no work

namespace installer
{
    [RunInstaller(true)]
    public partial class installer: System.Configuration.Install.Installer
    {
        public installer()
        {
            InitializeComponent();
        }



        public override void Rollback(IDictionary savedState)
        {
            base.Rollback(savedState);

        }

        public override void Commit(IDictionary savedState)
        {
            base.Commit(savedState);

        }


        public override void Uninstall(IDictionary savedState)
        {
            Process application = null;
            foreach (var process in Process.GetProcesses())
            {
                if (!process.ProcessName.ToLower().Contains(myapp)) continue;
                application = process;
                break;
            }

            if (application != null && application.Responding)
            {
              
                throw new InstallException("The process is running");
            }
                

        }
    }

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