Trying to filter Database Data based on ID

Question

Hello I am Trying to Filter Database Data base on ID but i cant get it to work;

 

Code:

public async Task<ActionResult> Index(string searchString, string description)
      {
          var AllProducts =  from m in _context.Products
                                        select m;

          List<int> IDList = new List<int>();
          IDList.Clear();

          int count = 0;

filter base on Title

          if (!String.IsNullOrEmpty(searchString))
          {
              count++;
              var FilterSearch = from Products in AllProducts
                                  where Products.Title.Contains(searchString)
                                  select Products.Id;

              foreach (int Product in FilterSearch)
                  IDList.Add(Product);
          }

 filter based on description

          if (!String.IsNullOrEmpty(description))
          {
              count++;
              var FilterDesc = from Products in AllProducts
                              where Products.ProductDescription.Contains(description)
                              select Products.Id;

              foreach (int Products in FilterDesc)
                  IDList.Add(Products);
          }

 making sure that only data that have ID simulair appear

          if (IDList.Count != 0)
          {
              var filter2 = IDList.GroupBy(x => x)
                             .Where(g => g.Count() == count)
                             .Select(y => y.Key)
                             .ToList();

             //under this line is what I think the problem
              AllProducts = AllProducts.Where(x => x.Id.Equals(filter2));

          }
              return View(await AllProducts.ToListAsync());

      }

 

everything works except for this code on line 47:

AllProducts = AllProducts.Where(x => x.Id.Equals(filter2));

when I type something in both search fields (description and searchStrings)

It return back nothing

 

Only when both search fields are empty they show all the data
 I just need the Data Database that have simulair ID's as those of the numbers in  filter2 list

 

How do i manage that?