How to specify foreign table key in EF Data Annotations?

I'm trying to configure relations between tables using Data Annotations of Entity Framework. I've found the following example:

public class Student
{
    public Student() { }

    public int StudentId { get; set; }
    public string StudentName { get; set; }

     public int StdandardRefId { get; set; }

    [ForeignKey("StandardRefId")]
    public virtual Standard Standard { get; set; }
}

public class Standard
{
    public Standard()
    {
        StudentsList = new List<Student>();
    }
    public int StandardId { get; set; }
    public string Description { get; set; }

    public virtual ICollection<Student> Students { get; set; }
}

Now, the ForeignKey attribute informs, that StandardRefId is a foregin key. I guess, that EF deduces the target table from type of property (Standard). However, I fail to see, how to define, which column the foreign key refers to. I tried:

[Column("CompanyId")]
public int CompanyId { get; set; }

[ForeignKey("CompanyId")]
[InverseProperty("Id")]
public CompanyDAL Company { get; set; }

However, all I got was the following exception:

An unhandled exception of type 'System.InvalidOperationException' occurred in EntityFramework.dll

Additional information: The property 'Id' cannot be configured as a navigation property. The property must be a valid entity type and the property should have a non-abstract getter and setter. For collection properties the type must implement ICollection where T is a valid entity type.

How can I explicitly say, that CompanyId points to Id property of Company table?