public class Media // One entity table{    public int Id { get; set; }    public string Name { get; set; }    public bool Enabled { get; set; }    public virtual ICollection
    
      ContractMedias { get; set; }}public class Contract // Second entity table{    public int Id { get; set; }    public string Code { get; set }    public virtual ICollection
     
       ContractMedias { get; set; }}public class ContractMedia // Association table implemented as entity{    public int MediaId { get; set; }    public int ContractId { get; set; }    public DateTime StartDate { get; set; }    public DateTime EndDate { get; set; }    public double Price { get; set; }    public virtual ICollection
      
        Medias { get; set; }    public virtual ICollection
       
         Contracts { get; set; }}
       
      
     
    

And after you created models/entities, you need to define relationships in context:

protected override void OnModelCreating(DbModelBuilder modelBuilder){   modelBuilder.Entity
    
     ()       .HasKey(c => new { c.MediaId, c.ContractId });   modelBuilder.Entity
     
      ()       .HasMany(c => c.ContractMedias)       .WithRequired()       .HasForeignKey(c => c.ContractId);   modelBuilder.Entity
      
       ()       .HasMany(c => c.ContractMedias)       .WithRequired()       .HasForeignKey(c => c.MediaId);  }