In Reflection, how to set a correct value for a property?

My target is to find all the "string" type properties, and assign them to a specific string value, like "This is a testing string".

I can find all the string type properties in a class now, but always have problems when assigning string value to the property in a class, which is the class property of another class.

 public class Credit_Card
{
    public string brand { get; set; }
    public int billing_phone { get; set; }
    public string credit_card_verification_number { get; set; }
    public Expiration expiration { get; set; }
}

public class Expiration
{
    public string month { get; set; }
    public string year { get; set; }
}

 class Program
{
    static void Main(string[] args)
    {
        Credit_Card credcard = new Credit_Card { brand = "Visa", billing_phone = 12345, credit_card_verification_number = "1234", expiration = new Expiration { month = "11", year = "2016" } };
        foreach (PropertyInfo prop in GetStringProperties(credcard.GetType()))
        {
            prop.SetValue(credcard,"testing string!!",null);
            Console.WriteLine(prop.GetValue(credcard,null));
        }
        Console.ReadLine();
    }

    public static IEnumerable<PropertyInfo> GetStringProperties(Type type)
    {
        return GetStringProperties(type, new HashSet<Type>());
    }

    public static IEnumerable<PropertyInfo> GetStringProperties(Type type, HashSet<Type> alreadySeen)
    {
        foreach (var prop in type.GetProperties())
        {
            var propType = prop.PropertyType;
            if (propType == typeof(string))
                yield return prop;
            else if (alreadySeen.Add(propType))
                foreach (var indirectProp in GetStringProperties(propType, alreadySeen))
                    yield return indirectProp;
        }
    }
}

It always throws the exception when the loop runs to "month" property of Expiration class.

How can I assign the correct value into the correct instance?