Null navigation property in partial class

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C#5.0

EF6.0

Hi,

I am working with EF 6, generated entity data model from mysql db. So i have some partial classes. The problem is that when i create a new object that have a navigation property, initially this navigation property is null. So there is my simle code:

public partial class Person
{
    public Person()
    {
        ....
    }

    ....

    public Nullable<int> phoneID{ get; set; }
    public virtual Phones phones{ get; set; }

}

.....


public partial class Person
{
    public string PhoneName { return this.phones.phonename; }

    //SO ERROR APPEARS HERE. this.phones is NULL
}