I have created an installer to install a windows service. Installer should ask user to name the service. Hence, I have created a custom UI in the installer with TextBox. 
When user runs the setup.exe file, installation starts and the custom UI shows up. User adds the name for the windows service but how shall I take the ServiceName as user input during installation and set default service name into service name provided by user during installation in that custom UI.
 
    