<Grid
  xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
  xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml">
    <StackPanel Orientation="Horizontal" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="50">
        <TextBlock Text="Rotation Speed:"/>
        <Slider Minimum="0" Maximum="50" Value="{Binding Speed, FallbackValue=0}" Width="100" Margin="10,0"/>
        <TextBlock Text="{Binding Speed, StringFormat=F2}"/>
    </StackPanel>
</Grid>

using System.ComponentModel;
using UnityEngine;

public class UnityInteraction : MonoBehaviour, INotifyPropertyChanged
{
    public GameObject cube;

    private float _speed;
    public float Speed
    {
        get { return _speed; }
        set
        {
            if (_speed != value)
            {
                _speed = value;
                OnPropertyChanged("Speed");
            }
        }
    }

    private void Start()
    {
        NoesisView view = GetComponent<NoesisView>();
        view.Content.DataContext = this;
    }

    private void Update()
    {
        if (cube != null)
        {
            cube.transform.Rotate(0, Time.deltaTime * Speed, 0);
        }
    }

    #region INotifyPropertyChanged implementation
    public event PropertyChangedEventHandler PropertyChanged;

    protected void OnPropertyChanged(string name)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(name));
        }
    }
    #endregion
}