/// <summary>
/// Serializes ShardKey data into a URL-safe string with a checksum, optionally including a concurrency stamp.
/// </summary>
/// <param name="includeConcurrencyStamp">Indicates whether the string should include concurrancy stamp data, if defined.</param>
/// <returns>A URL-safe string that can be re-serialized into a shard child.</returns>
public string ToExternalString()
{
return(StringExtensions.SerializeToExternalString(ToArray()));
}