using System;

using System.Reflection;

public class Program

{

    public static void Main()

    {

        var myClass = new MyClass() { Address = new () };

        Console.WriteLine(GetPropertyName(myClass, "Foo"));

    }

    private static string GetPropertyName(object model, string propertyName)

    {

        var propInfo = model as PropertyInfo;

        var props = propInfo != null ? propInfo.PropertyType.GetProperties() : model.GetType().GetProperties();

        foreach (var prop in props)

        {

            if (prop.Name == propertyName)

                return prop.Name;

​

            var subProb = GetPropertyName(prop, propertyName);

            if (subProb != null)

                return subProb;

        }

​

        return null;

    }

}

​

public class MyClass

{

    public string Name { get; set; }

    public AddressClass Address { get; set; }

}

​

public class AddressClass

{

    public MyClass MyClassProp { get; set; }

    public string AddressLine1 { get; set; }

    public string AddressLine2 { get; set; }

}