public static void Require(this IEnumerable argument, string argumentName, string message = null)
{
CollGuard.ShouldBeNotNull(argument, argumentName, message);
}
public static void Require <TKey, TValue>(this KeyValuePair <TKey, TValue> argument, string argumentName, string message = null)
{
CollGuard.ShouldBeNotNull(argument, argumentName, message);
}