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LINQ to SQL works only with SQL Server and SQL Server Compact 35, and has a fairly narrow goal It aims to reduce the overhead involved in writing data access code by providing a convenient C# syntax for working with the data in a SQL Server database The Entity Framework is similar, but it adds a couple of additional features First, it is designed to support multiple database vendors it has an open provider model, enabling support to be written for any database, and you can get providers for most popular databases Second, the Entity Framework allows the NET representation to have a different structure from your database schema if necessary You can define a conceptual model whose entities do not necessarily correspond directly to rows of particular tables an entity might include data that spans multiple tables in the database itself.

Category Field Account Entity Preferred Customer (value = 1) Standard (value = 2) VIP Customer (value = 200,000) Category Field Opportunity Entity Preferred Customer (value = 1) Standard (value = 2) VIP Customer (value = 3)

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This entity can then be represented as a single object Of course, it s possible to have your conceptual model correspond exactly to your database model you re free to create a straightforward mapping where one entity represents one row in one table Used in this way the Entity Framework, in conjunction with LINQ to Entities, makes LINQ to SQL look redundant So why do we have both The main reason LINQ to SQL exists is that it was ready when Visual Studio 2008 shipped, whereas Microsoft hadn t finished the Entity Framework at that point LINQ was a major part of that release, and since one of the main motivations behind LINQ was data access, shipping without a LINQ-based data access feature would have been a bit of a letdown.

script. To debug the server-side code, you need to attach to the server process running your application.

Allow privileges for remote access only to the appropriate users, and make sure that a proper remote access policy is in place. Allowing all users to have access to the VPN systems of the company is the easiest thing to do, but often it is not the most practical thing to do. Limit privileges for remote access systems to users who have a definite need for them. Allow access only to full-time employees and contractors that require access. By doing so, you reduce the attack surface a hacker has to attack your system, the need for redun dancy, the load on the gateways, and the amount of extraneous access to the Active

LINQ to SQL was developed by a different team (it came from the LINQ team, and not the data access group), and it was ready earlier, due no doubt in part to its less ambitious goals Microsoft has stated that while both technologies are fully supported, the Entity Framework is where the majority of its efforts will now be focused Visual Studio 2010 adds a few new LINQ to SQL features, but LINQ to Entities will see more development in the long run That s why this chapter s focus is the Entity Framework (although a lot of the concepts here apply equally to both technologies) That being said, both authors really like LINQ to SQL.

Formatting and translating U.S. phone numbers Updating a form based on a field value Filtering options based on the selection of a field value Displaying customer information on an opportunity form

In scenarios where we re using SQL Server and where we don t need the conceptual model and mapping features of the Entity Framework, we re both more inclined to use LINQ to SQL because of its simplicity and because we ve already learned how to use it But if you learn only one data access technology for NET, the Entity Framework looks like the better choice for the long term..

Now you can alter the trg_T1_i trigger to look for the signal in the session s context_info instead of using the temporary table technique:

At last we have a way to document inline and justify why certain configuration settings exists. As we get older and our GPOs get older keeping track of this will be a huge help. Kevin Sullivan Lead Program Manager Group Policy Per-setting comments are only supported for Administrative Template policy items. Within a given Administrative Template policy item, you will now see a Comment tab, where you can enter your text, as shown in Figure 7-8.

Sometimes explained as the Don t Call Us, We ll Call You principle. It s the idea that a component or service should do one thing, and do it well, and not have to know too much if anything about the other matters in the context of doing its job.

string selectSQL = SELECT Id, Name, Description FROM Products WHERE Id > 90"; // Fill a DataSet from the Products table using the simple approach. DataSet simpleDS = defaultDB.ExecuteDataSet(CommandType.Text, selectSQL); DisplayTableNames(simpleDS, "ExecuteDataSet"); // Fill a DataSet from the Products table using the LoadDataSet method. // This allows you to specify the name(s) for the table(s) in the DataSet. DataSet loadedDS = new DataSet("ProductsDataSet"); defaultDB.LoadDataSet(CommandType.Text, selectSQL, loadedDS, new string[] { "Products" }); DisplayTableNames(loadedDS, "LoadDataSet");

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