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The DataContext is intended to be a short-lived object We need to be aware of the context(s) we re using and how the identity- and change-tracking services work in order to avoid unexpected results When only fetching data, we can create the context as we fetch the values and then throw it away In that case, we can optimize the context by setting the ObjectTrackingEnabled property to false This increases performance by disabling the change- and identity-tracking services, but disables the ability to update the changes If we need to be able to update the data, be aware of the context s scope and manage it appropriately In Windows applications, it may be acceptable to retain a context as changes are made, but realize the performance and memory overhead that come with retaining all objects and the changed values.

In this case, the wizard did a pretty good job of identifying the separate company and contact information and splitting the fields into two tables. It also recognized that ContactType has lots of repeating values and perhaps should be in a separate lookup table, but it incorrectly related that table to the company information. There isn t enough data (only 18 rows and each contact is related to only one company) in the table for the wizard to have noticed a many-to-many relationship between companies and contacts. It probably kept the HomeStateOrProvince field with the company data because it didn t see a different value across multiple rows for the same company. It also incorrectly used the Department field as the primary key for the table containing the ContactType lookup field. 167

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The intended usage pattern for LINQ to SQL is as a unit of work, which uses the following pattern: Query Report Edit Submit Dispose As soon as we no longer need to maintain changes on an object, we should clean up the context and create a new one..

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When control returns to KiInitializeKernel, the last step is to allocate the DPC stack for the current processor and the I/O privilege map save area (on x86 systems only), after which control proceeds to the Idle loop, which then causes the system thread created in step 3 of the previous process description to begin executing phase 1 (Secondary processors wait to begin their initialization until step 8 of phase 1, described in the following list) Phase 1 consists of the following steps: 1 Phase1 InitializationDiscard, which, as the name implies, discards the code that is part of the INIT section of the kernel image in order to preserve memory 2 The initialization thread sets its priority to 31, the highest possible, in order to prevent preemption 3 HalInitSystem prepares the system to accept interrupts from devices and to enable interrupts 4.

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Occasionally, working in a connected environment with the context is either inadvisable or impossible. This situation typically occurs when updating values from an ASP.NET page, web service, or other similar disconnected model, including Workflow (WF) and Windows Communication Foundation (WCF). When fetching records in the disconnected model, we need to encapsulate the results. We cannot cache the context or transmit it to the disconnected user. Since the object must be divorced from the context, we can no longer rely on the context s change-tracking or identity-management services. Transmission to the client is limited to simple objects (or an XML representation of the objects). Managing changes becomes a bigger challenge in the disconnected model.

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