C# Loop/Iterate through object to get property values with complex property types

I am trying to find a way to loop through and iterate through an object to get all of it's properties (their name and their value) of an object. I can successfully iterate through the simple properties (such as strings, int, etc.., but when it has a property that contains properties - that is where the problem is...

[ Working for Simple string/int/bool properties ], but I need something that will work with nested / complex property types.

            foreach (PropertyInfo spotProperties in spot.GetType().GetProperties())
            {
                // Simple property type (string, int, etc...)  add the property and its value to the node.
                var attributeName = spotProperties.Name; 
                resultElement.Add(new XElement(attributeName, spotProperties.GetValue(spot, null)));
            }

Sample code of what I am trying to accomplish, but could not get to work // Unable to get to work loop through complex property types.

            foreach (PropertyInfo spotProperties in spot.GetType().GetProperties())
            {
                if (--spotProperties is complex type then --)
                {
                    // The item is a complex data type, and needs to have it's properties iterated and added to the node.
                    foreach (PropertyInfo childSpotProperty in spotProperties.GetValue(spot, null).GetType().GetProperties())
                    {
                        var attributeName = ((DisplayNameAttribute)childSpotProperty.GetCustomAttributes(typeof(DisplayNameAttribute), false).FirstOrDefault() as DisplayNameAttribute)?.DisplayName ?? childSpotProperty.Name;
                        //resultElement.Add(new XElement(attributeName, childSpotProperty.GetValue(childSpotProperty, null)));
                    }
                }
                else
                {
                    // Simple property type (string, int, etc...)  add the property and its value to the node.
                    var attributeName = spotProperties.Name;
                    resultElement.Add(new XElement(attributeName, spotProperties.GetValue(spot, null
                }
            }

Please let me know if anyone has any idea. Thanks, I appreciate any feed back.