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Synchronous or Asynchronous functionality- Synchronicity refers to the binding of the client to the execution of the service. In synchronous operations, the client will actually wait for the web service to complete an operation. An example of this is probably a scenario wherein a database read and write operation are being performed. If data is read from one database and subsequently written to another, then the operations have to be done in a sequential manner. Asynchronous operations allow a client to invoke a service and then execute other functions in parallel. This is one of the common and probably the most preferred techniques for ensuring that other services are not stopped when a particular operation is being carried out.
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The first line is the 'WebInvoke' attribute which has been attached to our method. This allows the method to be invoked via the POST call. The RequestFormat and ResponseFormat attribute have to be mentioned as JSON, since when posting values to a RESTFul web service, the values have to be in this format. Note that the Method parameter is being set to "DELETE." This means that whenever we issue the DELETE verb, this method will be invoked.
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Make sure the request type is "DELETE" and the correct URL is being hit, which in our case should be http://localhost:52645/TutorialService.svc/Tutorial. Ensure that the id which is used to delete a string in the list sent via the URL as a parameter. In our example, we are sending 1 so this will delete the 2nd element in our collection which is "Queues".
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