Adding associated / related entities with LINQ to SQL is a breeze. In the snippet below we add a new TaskList with a new Task (‘Refactor’) for a specific Employee. LINQ to SQL keeps track of the associations and adds them as expected. More…
Quick snippet below as a reminder of the most basic CUD operations in LINQ to SQL. We insert new entities with InsertOnSubmit on the specific entity collection in the datacontext. We delete existing entities the same way with the use of DeleteOnSubmit. More…
We use a XML namespace to avoid name conflicts. With a namespace we can more specifically point to an element in a XML structure. In LINQ to XML a namespace is represented by the XNamespace class. In the code snippet below we simply add a fictive namespace to the list of cars we created in the previous example. More…
In the System.Xml.Linq namespace we find a lot of handy classes for creating and manipulating XML structures and files. XDocument respresents a complete XML structure with nodes (XNode) being elements (XElement) having attributes (XAttribute). More…
WCF Reliable Sessions, as defined by the WS-ReliableMessaging protocol, assures that SOAP messages don’t get lost, duplicated and/or re-ordered. It also prevents transport level errors (e.g. dropped connection). The reliability is at the SOAP message level, not at the transport level like TCP. More…
In the previous example we did an impersonation of a windows user on a service operation. With the PrincipalPermission attribute we can also provide role based security. To test this on the WriteToLogFile operation of the EchoService, we create a local group named EchoLogWriters. More…
On to client and service security in WCF. You can set the protection level of messages sent over the wire at the message, fault, operation and/or service level in WCF. There are three message ProtectionLevel property flavors to set as an attribute. More…
In the previous example I enabled includeExceptionDetailInFaults in app.config to get some more details on exceptions thrown over the wire. While this is nice for developing once the service hits production this can breach security. This is why it is set to false by default. More…