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This LoadOption argument has now created a bit of a problem, though. Notice that the description of each possible value refers to updating the values of a column. This, of course, means updating the columns of a record already in the destination DataTable. How would the CopyToDataTable operator possibly know which record already in the destination DataTable corresponds to a record in the source DataTable In other words, when it tries to copy a record from the source DataTable to the destination DataTable and has to honor the LoadOption parameter, how does it know whether it should just add the record from the source DataTable or update an already existing record in the destination DataTable The answer is that it doesn t, unless it is aware of primary key fields in the DataTable. Therefore, for this prototype of the CopyToDataTable operator to work properly, the destination DataTable object must have the appropriate fields specified as the primary key fields. Without specifying primary keys, this prototype will result in appending all the records from the source DataTable to the destination DataTable. There is one additional complication. Since by using this prototype you are possibly interested in original versus current version values of fields, do not forget that with this prototype of the CopyToDataTable operator, a field doesn t have an original version unless the AcceptChanges method has been called. Attempting to access the original version when one does not exist causes an exception to be thrown. However, you can call the HasVersion method on each DataRow object before attempting to access the original version to determine if there is an original version to prevent this type of exception.

The command entered using either of these approaches tells SQLMetal to generate the source code into a file named Northwind.cs in the current directory. I will cover all the program s options in the next chapter. Copy the generated Northwind.cs file into your project by adding it as an existing item. You may now utilize LINQ to SQL on the Northwind database using the entity classes contained in the Northwind.cs file.

As an example of the first CopyToDataTable operator prototype, we will simply modify a field in a DataTable, create a new DataTable from the modified DataTable by calling the CopyToDataTable operator, and then display the contents of the new DataTable. Listing 10-17 is the code.

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Student[] students new Student { Id new Student { Id new Student { Id new Student { Id }; = = = = = { 1, Name = "Joe Rattz" }, 7, Name = "Anthony Adams" }, 13, Name = "Stacy Sinclair" }, 72, Name = "Dignan Stephens" }

Be cautious of making changes to the generated entity class source file. You may find you need to regenerate it at some later point, causing you to lose any changes. You may desire to add business logic by adding methods to the entity classes. Instead of modifying the generated file, consider taking advantage of C# 2.0 partial classes to keep the added properties and methods in a separate source module.

s Note You can add code to restrict which components can be rendered within a facet, but it is good practice to allow application developers to nest any components standard or custom within a facet. If you need to recommend a certain type of component to application developers, you can use faces-config.xml to list any recommended components using metadata defined by JSR-276.

DataTable dt1 = GetDataTable(students); Console.WriteLine("Original DataTable:"); foreach (DataRow dataRow in dt1.AsEnumerable()) { Console.WriteLine("Student Id = {0} is {1}", dataRow.Field<int>("Id"), dataRow.Field<string>("Name")); }

I will also need to generate a mapping file that some of the examples will use. Again, I will use SQLMetal for this purpose. So, from the same command line and path, execute the following command: sqlmetal /map:northwindmap.xml "C:\Northwind.mdf" /pluralize /functions /sprocs /views /namespace:nwind Again, pay close attention to the casing used to specify the MDF file. This will generate a file named northwindmap.xml into the current directory.

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