'MyObject' не содержит определения для - C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
 
using System.Xml.Serialization;
 
namespace radio.Models
{
    [Serializable]
    public class Song
    {
        [XmlAttribute]
        public int ID { get; set; }
 
        [XmlAttribute]
        public string Name { get; set; }
        [XmlAttribute]
        public string Artist { get; set; }
        [XmlAttribute]
        public int Duration { get; set; }
        [XmlAttribute]
        public string Album { get; set; }
        [XmlAttribute]
        public int Year { get; set; }
 
        [XmlArrayItem(Type = typeof(Tag))]
        public List<Tag> Tags { get; set; }
 
        [XmlArrayItem(Type = typeof(Genre))]
        public List<Genre> Genres { get; set; }
 
        [XmlIgnore]
        public string Path { get; set; }
        [XmlIgnore]
        public string StringDuration 
        {
            set { StringDuration = value; } 
            get { return getStringDuration(Duration); }
        }
 
        public Song() { }
 
        public Song(int ID, string Name, string Artist, int Duration, List<Tag> Tags, List<Genre> Genres, int Year)
        {
            this.ID = ID;
            this.Name = Name;
            this.Artist = Artist;
            this.Duration = Duration;
            this.Tags = Tags;
            this.Genres = Genres;
            this.Year = Year;
        }
 
        public override string ToString()
        {
            return Name;
        }
 
    }
}

public ObservableCollection<Song> Search<Song>(SearchParams searchParams, ObservableCollection<Song> listToSearch)
        {
            List<Song> searchResults = new List<Song>();
 
            foreach (Song song in listToSearch)
            {
                if (song.Name.ToLower().Equals(searchParams.Name.ToLower()))
                {
                    searchResults.Add(song);
                }
            }
 
            ObservableCollection<Song> listItems = listToSearch.Where(i => i.Song == searchParams.Name);
 
            return null;
        }

if (song.Name.ToLower().Equals(searchParams.Name.ToLower()))

i => i.Name == searchParams.Name