PropertyBindingInspector.cs

private PropertyBinding _bindingClass;

private void RefreshSourceProperties()
{
    if (_bindingClass.Source == null) return;
    var tempSource = from sourceProp in _bindingClass.Source.GetType().GetProperties(BindingFlags.DeclaredOnly | 
                                                                                     BindingFlags.Public | 
                                                                                     BindingFlags.Instance)
                     select sourceProp;
    _sourceProperties = tempSource.ToList();
}

private void RefreshTargetProperties()
{
    if (_bindingClass.Target == null || _bindingClass.Source == null) return;
    var tempTarget = from targetProp in _bindingClass.Target.GetType().GetProperties(BindingFlags.DeclaredOnly | 
                                                                                     BindingFlags.Public | 
                                                                                     BindingFlags.Instance)
                     where targetProp.PropertyType.IsAssignableFrom(_bindingClass.SourceProperty.PropertyType) || 
                                                                    targetProp.PropertyType == typeof(string)
                     select targetProp;
    _targetProperties = tempTarget.ToList();
}