How to implement Cascade on Delete Using Asp.coreBoilerplate Entity Framework?

Question

I want to implement Cascade on delete functionality for asp.net core boilerplate. But I am unable to do so? Here is what I have done to do this.

Company is the parent Class:

  public class Company:FullAuditedEntity<long>
{
    public string CompanyName { get; set; }

    public string EmployeesCount { get; set; }

    public virtual ICollection<Employees> Employees { get; set; }
}

Employee is the Child Class which is having one to many relationship with the Company class.

public class Employees:FullAuditedEntity<long>
{
    public string EmployeeName { get; set; }
    public string Salaray { get; set; }

    [ForeignKey("Company")]
    public long CompanyId { get; set; }
    public virtual Company Company { get; set; }
}

Here is what I have done in the Dbcontext class to implement Cascade on Delete functionality.

 protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<Employees>()
                .HasOne(e => e.Company)
                .WithOne()
                .OnDelete(DeleteBehavior.Cascade).HasForeignKey<Employees>(t=>t.CompanyId);
    }

But when I delete a record for the parent entity(Company) the relevant record from the child table(Employee) is not deleted.