Overriding ToString() of List

Perhaps a bit off-topic, but I use a ToDelimitedString extension method which works for any IEnumerable<T>. You can (optionally) specify the delimiter to use and a delegate to perform a custom string conversion for each element:

// if you've already overridden ToString in your MyClass object...
Console.WriteLine(list.ToDelimitedString());
// if you don't have a custom ToString method in your MyClass object...
Console.WriteLine(list.ToDelimitedString(x => x.Property1 + "-" + x.Property2));

// ...

public static class MyExtensionMethods
{
    public static string ToDelimitedString<T>(this IEnumerable<T> source)
    {
        return source.ToDelimitedString(x => x.ToString(),
            CultureInfo.CurrentCulture.TextInfo.ListSeparator);
    }

    public static string ToDelimitedString<T>(
        this IEnumerable<T> source, Func<T, string> converter)
    {
        return source.ToDelimitedString(converter,
            CultureInfo.CurrentCulture.TextInfo.ListSeparator);
    }

    public static string ToDelimitedString<T>(
        this IEnumerable<T> source, string separator)
    {
        return source.ToDelimitedString(x => x.ToString(), separator);
    }

    public static string ToDelimitedString<T>(this IEnumerable<T> source,
        Func<T, string> converter, string separator)
    {
        return string.Join(separator, source.Select(converter).ToArray());
    }
}