How can I binding content of label in WPF VB.NET

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C#

VB

.NET

XAML

WPF

Binding

How can I bind the Text of Label to property Summ ?

Public Class SummClass
    Implements INotifyPropertyChanged
    Public Event PropertyChanged As PropertyChangedEventHandler Implements INotifyPropertyChanged.PropertyChanged
    Private _Summ As Integer
    Public Property Summ As Integer
        Get
            Return _Summ
        End Get
        Set(value As Integer)
            _Summ = value
            RaiseEvent PropertyChanged(Me, New PropertyChangedEventArgs(NameOf(Summ)))
        End Set
    End Property
End Class

Public Class ReportClass
    Public Property Month As Integer
    Public Property Summary As New ObservableCollection(Of SummClass)
End Class

Public Property MyReport As New ReportClass

What I have tried:

Dim binding As New Binding()
    binding.Path = New PropertyPath(MyReport.Summary(i).Summ)
    binding.RelativeSource = New RelativeSource(RelativeSourceMode.FindAncestor, GetType(Window), 1)
    binding.Mode = BindingMode.TwoWay
    binding.UpdateSourceTrigger = UpdateSourceTrigger.PropertyChanged

    LabelSumMamooriat.SetBinding(Label.ContentProperty, binding)

'i' is a number between 0 to 4 which user set. Because this company has 5 employees.