C # and Ajax filtering (4 filters, multiple options each)

To explain that I have 4 types of filters: Location, Type, Grade, Facilities.

Currently everything works for me, but each filter works as an OR, so it just adds the results. I want it to be AND (& &) between filter types and every type of the same filter becomes OR. So an example is "Scotland || England && & && 4 stars || 5 stars & & Play & Play Area Area Pool.

I tried to create a list that removed additions that were not equal to the results, but it won't work unless you start from the location.

Here is my current code that works like all OR filters.

// Get by Filters //
    public String GetAccomFilterPages(Int32 ModelID, Int32 page, String location, String type, String grade, String facility)
    {
        // Builder Start //
        AccommodationList Model = Umbraco.TypedContent(ModelID) as AccommodationList;
        StringBuilder HTMLAccom = new StringBuilder();

        //Build list and use | to split //
        List<Accommodation> Results = new List<Accommodation>();
        Boolean noFilter = true;

        // Location
        if (!String.IsNullOrEmpty(location))
        {
            String[] Locations = location.Split('|');
            foreach (String locSearch in Locations)
            {
                if (!String.IsNullOrEmpty(locSearch))
                {
                    foreach (var locItem in Model.Descendants<Accommodation>().Where(x => x.Location.Where(xx => xx.Name.Replace("&", "and") == locSearch.Replace("&", "and")).Count() > 0))
                    {
                        if (!Results.Contains(locItem))
                        {
                            Results.Add(locItem);
                        }
                    }
                }
            }
            noFilter = false;
        }

        // Accom Types
        if (!String.IsNullOrEmpty(type))
        {
            String[] Types = type.Split('|');
            foreach (String typSearch in Types)
            {
                if (!String.IsNullOrEmpty(typSearch))
                {
                    foreach (var typItem in Model.Descendants<Accommodation>().Where(x => x.AccommodationType.Where(xx => xx.Name.Replace("&", "and") == typSearch.Replace("&", "and")).Count() > 0))
                    {
                        if (!Results.Contains(typItem))
                        {
                           Results.Add(typItem);
                        }
                    }
                }
            }
            noFilter = false;
        }

        // Grades
        if (!String.IsNullOrEmpty(grade))
        {
            String[] Grades = grade.Split('|');
            foreach (String gradeSearch in Grades)
            {
                if (String.IsNullOrEmpty(gradeSearch))
                {
                    foreach (var gradeItem in Model.Descendants<Accommodation>().Where(x => x.GradeRating.Where(xx => xx.Name.Replace("&", "and") == gradeSearch.Replace("&", "and")).Count() > 0))
                    {
                        if (!Results.Contains(gradeItem))
                        {
                            Results.Add(gradeItem);
                        }
                    }
                }
            }
            noFilter = false;
        }

        // Facilities
        if (!String.IsNullOrEmpty(facility))
        {
            String[] Facilities = facility.Split('|');
            foreach (String facSearch in Facilities)
            {
                if (String.IsNullOrEmpty(facSearch))
                {
                    foreach (var facItem in Model.Descendants<Accommodation>().Where(x => x.FacilitiesAvaliable.Where(xx => xx.Name.Replace("&", "and") == facSearch.Replace("&", "and")).Count() > 0))
                    {
                        if (!Results.Contains(facItem))
                        {
                            Results.Add(facItem);
                        }
                    }
                }
            }
            noFilter = false;
        }

        if (noFilter == true)
        {
            Results.AddRange(Model.Descendants<Accommodation>());
        }

        // End Filtering //
        int skip = 0;
        int take = 5;
        int totalNodes = Results.Count();
        int totalPages = (int)Math.Ceiling((double)totalNodes / take);

        // Results Count //
        int lastIdOnPage = take;

        if (page != 1)
        {
            skip = take * (page - 1);
            lastIdOnPage = (totalNodes - skip);
            if (lastIdOnPage > take)
            {
                lastIdOnPage = skip + take;
            }
            else
            {
                lastIdOnPage = skip + lastIdOnPage;
            }

        }
        else if (take > totalNodes)
        {
            lastIdOnPage = totalNodes;
        }
        int firstIdOnPage = skip + 1;

        // Start Print of Page //
        // Loop through Accoms //

        foreach (Accommodation ACC in Results.Skip(skip).Take(take))
        {
            ....
    }

        // Filter Reset //
        if (noFilter == false)
        {
            HTMLAccom.AppendLine("<li><a onclick=\"GetAccomPages(1, false)\">Remove Filters</a></li>");
        }

        // Pagination Results //
        if (firstIdOnPage == lastIdOnPage)
        {
            HTMLAccom.AppendLine("<p>" + firstIdOnPage + " of " + totalNodes + " results</p>");
        }
        else if (lastIdOnPage == 0)
        {
            HTMLAccom.AppendLine("<p> No results</p>");
        }
        else
        {
            HTMLAccom.AppendLine("<p>" + firstIdOnPage + " - " + lastIdOnPage + " of " + totalNodes + " results</p>");
        }

        // Page Links //
        if (totalPages > 1)
        {
            int countPages = 0;
            HTMLAccom.AppendLine("<ul class=\"pagination\">");
            while (totalPages > countPages)
            {
                countPages++;
                HTMLAccom.AppendLine("<li " + (countPages == page ? "class=\"active\">" : "") + "<a onclick=\"GetAccomFilterPages(" + (countPages) + ")\">" + countPages + "</a></li>");
            }
            HTMLAccom.AppendLine("</ul>");
        }

        return HTMLAccom.ToString();
    }

      

        
        
        
      

    

Frontend JS / AJAX (no url change:

$(document).ready(function () {
    var page = @page + "";
    var ShowAll = @ShowAll + "";

    if (page != "")
        GetAccomPages(page, false)
    else
        GetAccomPages(1, false);
});

function GetAccomPages(page, ShowAll) {
...
}

function GetAccomFilterPages(page, location, type, grade, facility) {

    var filterName = [locFilterName, typeFilterName, gradeFilterName, facFilterName];
    for (name in filterName){
        if ($("#ft" + name).prop('checked')) {
            $("#ft" + name).prop('checked', false)
        } else {
            $("#ft" + name).prop('checked', true)
        }
    }

    var locFilterName = "";
    var typeFilterName = "";
    var gradeFilterName = "";
    var facFilterName = "";

    var rows = $('.chkLoc');
    $.each(rows, function () {
        if ($(this).prop('checked')) {
            locFilterName += $(this).val() + "|";
        }
    });

    var rows = $('.chkType');
    $.each(rows, function () {
        if ($(this).prop('checked')) {
            typeFilterName += $(this).val() + "|";
        }
    });

    var rows = $('.chkGrade');
    $.each(rows, function () {
        if ($(this).prop('checked')) {
            gradeFilterName += $(this).val() + "|";
        }
    });

    var rows = $('.chkFac');
    $.each(rows, function () {
        if ($(this).prop('checked')) {
            facFilterName += $(this).val() + "|";
        }
    });

    //alert(locFilterName + typeFilterName + gradeFilterName + facFilterName);

    var AC = "ModelID=" + @Model.Content.Id + "&page=" + page + "&location=" + locFilterName + "&type=" + typeFilterName + "&grade=" + gradeFilterName + "&facility=" + facFilterName;
        $.ajax({
            type: "GET",
            url: "/Umbraco/Api/AccomAjax/GetAccomFilterPages",
            data: AC,
            success: function (data) {
                $("#GetAccom").html(data);
            }
        });

    }

      

        
        
        
      

    

This is a fully working OR filter that updates as you check the box, so feel free to take any ideas from it if you like (if you stumbled upon this while looking at how to do it), but I need it and in between each of the filters, and I'm stuck in a swamp as they would say. I'm also a PHP developer, so if I did anything unnecessary please give some CC's.

Thanks in Advance.