Connection with previous posts

This is the last post of the series of how we can use Entity Framework Code First to create a multitenant application. You are requested first to read Part 1 where there is an introduction in the problem we are trying to solve and some infrastructure code required to continue. Part 2 describes the query filtering that is happening automatically in the entire application. In this post I am going to show how we can use the CommandTree interceptor in order to modify the insert, update and delete commands. The idea of implement something like this came to my mind after watching Rowan Miller’s excellent session in North America TechEd, which I highly recommend you to watch.
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A short introduction

In continuation of Part 1 about creating a multitenant application with Entity Framework Code First we are going to see how we can use Interceptors to apply filtering when querying the data in a transparent way for our application. It is highly recommended to read the first part as this post assumes you are already familiar with the problem.
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A highly increasing request we have to serve as developers, especially after Software as a Service revolution, is to provide software that is able to handle individual users in one application by separate each user’s data. This feature is called Multitenancy and there are several ways to achieve it. In this series of posts I will try to demonstrate how we can achieve the data isolation by using some advance features of Entity Framework.
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