UriBuilder.ToString - The resulting string always contains port, even if it is the default port. For example - http://localhost:80/wiktips
UriBuilder.Uri.ToString - The resulting string only contains the port if it is not the default port for the scheme. For example - http://localhost/wiktips
Therefore, in most of the cases UriBuilder.Uri.ToString should be used to omit redundant port specification.
429e3eb6-4a36-4a31-b22b-f59d885cff02|1|5.0