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Showing content from https://docs.microsoft.com/en-us/dotnet/api/system.data.linq.mapping.associationattribute.thiskey below:

AssociationAttribute.ThisKey Property (System.Data.Linq.Mapping) | Microsoft Learn

Gets or sets members of this entity class to represent the key values on this side of the association.

public:
 property System::String ^ ThisKey { System::String ^ get(); void set(System::String ^ value); };

public string ThisKey { get; set; }

member this.ThisKey : string with get, set

Public Property ThisKey As String

Default = Id of the containing class.

[Association(Name="FK_CustomerCustomerDemo", Storage="_CustomerDemographic", ThisKey="CustomerTypeID", IsForeignKey=true)]
public CustomerDemographic CustomerDemographic
{
    get
    {
        return this._CustomerDemographic.Entity;
    }
    set
    {
        CustomerDemographic previousValue = this._CustomerDemographic.Entity;
        if (((previousValue != value)
                    || (!this._CustomerDemographic.HasLoadedOrAssignedValue )))
        {
            this.SendPropertyChanging();
            if ((previousValue != null))
            {
                this._CustomerDemographic.Entity = null;
                previousValue.CustomerCustomerDemos.Remove(this);
            }
            this._CustomerDemographic.Entity = value;
            if ((value != null))
            {
                value.CustomerCustomerDemos.Add(this);
                this._CustomerTypeID = value.CustomerTypeID;
            }
            else
            {
                this._CustomerTypeID = default(string);
            }
            this.SendPropertyChanged("CustomerDemographic");
        }
    }
}

<Association(Name:="FK_CustomerCustomerDemo", Storage:="_CustomerDemographic", ThisKey:="CustomerTypeID", IsForeignKey:=True)>
Public Property CustomerDemographic() As CustomerDemographic
    Get
        Return Me._CustomerDemographic.Entity
    End Get
    Set(ByVal value As CustomerDemographic)
        Dim previousValue As CustomerDemographic = Me._CustomerDemographic.Entity
        If (((previousValue Is value) _
           = False) _
           OrElse (Me._CustomerDemographic.HasLoadedOrAssignedValue = False)) Then
            Me.SendPropertyChanging()
            If ((previousValue Is Nothing) _
               = False) Then
                Me._CustomerDemographic.Entity = Nothing
                previousValue.CustomerCustomerDemos.Remove(Me)
            End If
            Me._CustomerDemographic.Entity = value
            If ((value Is Nothing) _
               = False) Then
                value.CustomerCustomerDemos.Add(Me)
                Me._CustomerTypeID = value.CustomerTypeID
            Else
                Me._CustomerTypeID = CType(Nothing, String)
            End If
            Me.SendPropertyChanged("CustomerDemographic")
        End If
    End Set
End Property

For multiple members, use a comma-separated list.

The key is not required to match the primary key or foreign key, but the user-stated cardinality (0-1 for EntityRef<TEntity> or 0-n for EntitySet<TEntity>) is assumed to be true.

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