format.cs

public static class Format
{
	public static string Invariant(object value)
	{
		return String.Format(CultureInfo.InvariantCulture, "{0}", value);
	}

	public static string Current(object value)
	{
		return String.Format(CultureInfo.CurrentCulture, "{0}", value);
	}
}

// Usage:

Format.Invariant(x)

Format.Current(x)