Wix installer- capture user input during install

<pre lang="c#">using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.Deployment.WindowsInstaller;
using System.Configuration;
namespace CustomAction
{
public class CustomAction
{
    [CustomAction]
    public static ActionResult saveSales(Session session)
    {

        string salesPass = session["sales_pwd"];
        var fileMap = new ExeConfigurationFileMap();
        fileMap.ExeConfigFilename = "myApp.exe.config";
        var config = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
        config.AppSettings.Settings["salesPass"].Value =salesPass;
        config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection("appSettings");
        return ActionResult.Success;
    }
    [CustomAction]
    public static ActionResult saveSuper(Session session)
    {
        string adminPass = session["admin_pwd"];
        var fileMap = new ExeConfigurationFileMap();
        fileMap.ExeConfigFilename = "myApp.exe.config";
        var config = ConfigurationManager.OpenMappedExeConfiguration(fileMap, ConfigurationUserLevel.None);
        config.AppSettings.Settings["superPass"].Value = adminPass;
        config.Save(ConfigurationSaveMode.Modified);
        ConfigurationManager.RefreshSection("appSettings");
        return ActionResult.Success;
    }
}
}

<InstallExecuteSequence>
  <Custom Action='saveSales' After='InstallFinalize'>NOT Installed</Custom>
  <Custom Action='saveSuper' After='saveSales'>NOT Installed</Custom>

</InstallExecuteSequence>

<Binary Id="CustomAction.dll" SourceFile="$(var.caPath)\CustomAction.CA.dll" />
<CustomAction Id="saveSales" BinaryKey="CustomAction.dll"
  DllEntry="saveSales" Execute="immediate" />
<CustomAction Id="saveSuper" BinaryKey="CustomAction.dll"
  DllEntry="saveSuper" Execute="immediate" />

config.AppSettings.Settings["superPass"].Value = adminPass; config.Save(ConfigurationSaveMode.Modified); ConfigurationManager.RefreshSection("appSettings");