New Post: ProgressText of custom action

//css_dir ..\..\;//css_ref System.Core.dll;//css_ref Wix_bin\SDK\Microsoft.Deployment.WindowsInstaller.dll;using System;
using System.Linq;
using System.Xml.Linq;
using System.Xml;
using System.Windows.Forms;
using Microsoft.Deployment.WindowsInstaller;
using WixSharp;

class Script
{
    staticpublicvoid Main(string[] args)
    {
        var project = 
            new Project("CustomActionTest",
                new ManagedAction(new Id("MyAction"), 
                                  "MyAction", 
                                  Return.check, 
                                  When.After, 
                                  Step.InstallInitialize, 
                                  Condition.NOT_Installed));

        project.WixSourceGenerated += project_WixSourceGenerated;
        project.BuildMsiCmd();
    }

    staticvoid project_WixSourceGenerated(XDocument document)
    {
        document.FindSingle("Product")
                .Add(new XElement("UI",
                         new XElement("ProgressText", "Running Server...").AddAttributes("Action=MyAction")));
    }
}

publicclass CustomActions
{
    [CustomAction]
    publicstatic ActionResult MyAction(Session session)
    {
        MessageBox.Show("Hello World!");
        session.Log("Begin MyAction Hello World");

        return ActionResult.Success;
    }
}