log.Debug("Executing C# template");

Item item = package.GetByName(Package.ComponentName);
Component component = (Component)engine.GetObject(item);
var versions = component.GetVersions().Cast<Component>().OrderByDescending(v => v.RevisionDate);
var ids = string.Join(",", versions.Select(c => c.Id.ToString()).ToList());
var vs = string.Join(",", versions.Select(c => c.Id.Version).ToList());

log.Debug(ids);
log.Debug(vs);

Debugging was started in process 'TcmTemplateDebugHost' with id 18688
CSharpSourceTemplate: Executing C# template
CSharpSourceTemplate: tcm:346-403444-v2,tcm:346-403444,tcm:346-403444-v1
CSharpSourceTemplate: 2,-1,1