Question

Goal:
Get all panels whose due date is <= today’s date.

Entity/db diagram:

Controller:

    public ActionResult Index(PanelViewModel panelViewModel) 
    {
        panelViewModel.Panels = _panelRepository.GetPanels()
                                  .Where(p => p.PanelApplicationForms.Count > 0
                                          && p.IsPublish
                                          && p.PanelApplicationForms != null)
                                  .OrderBy(t => t.Title);

        return View(panelViewModel);
    }

Answer 1

Try

public ActionResult Index(PanelViewModel panelViewModel) 
{
    var proj  = _panelRepository.GetPanels()
                              .Where(p => p.PanelApplicationForms.Count > 0
                                      && p.PanelApplicationForms
                                         .Any(f => f.PanelApplicationFormVersions
                                           .Any(v => v.DueDate <= today))
                                      && p.IsPublish
                                      && p.PanelApplicationForms != null)
                              .OrderBy(t => t.Title)
                              .Select(p => new { 
                                          Panel = p, 
                                          PanelApplicationForms = p.PanelApplicationForms
                                           .Where(f => f.PanelApplicationFormVersions
                                           .Any(v => v.DueDate <= today))
                                          })
                              .ToList();

    panelViewModel.Panels = proj.Select(p => p.Panel);

    return View(panelViewModel);
}