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hen I started composing cryptic crossword puzzles, more years ago than I care to admit, I produced camera-ready grids with pen and ink and Letraset A few years later, the magazine purchased new phototypesetting equipment that could draw lines and boxes (I was working as a layout artist and typesetter for the magazine) At about the same time, I acquired my first computer, a pocket-sized TRS-80 PC-1 with all of 15KB of memory, and a one-line, 24-character LCD display With the PC-1 s limited BASIC language, I wrote my first useful program It generated the code to produce crossword grids on the typesetter, which used a markup language reminiscent (if memory serves me correctly) of SGML I had to transcribe it by hand, as there was no way for the machines to talk to each other.

The LINQ to SQL framework provides for concurrency conflict detection on records retrieved by a query. Conflict detection is necessary, because from the moment you retrieve records from the database to the moment you call the SubmitChanges method to transmit your data changes to the database, one or more of those records, or related records, could be changed by some other database user. For example, another program could access the same table and update its content. In the event of a conflicting change from another user, the SubmitChanges method will raise a ChangeConflictException. You can then manage that exception and decide what your best course of action is to resolve the conflict. The following example is similar to the update example in the previous section, but with a new instruction to wait for user input before updating the record with the SubmitChanges call. AdventureWorksDataContext db = new AdventureWorksDataContext(); CountryRegion zzRegion = (from r in db.CountryRegions where r.CountryRegionCode == "ZW" select r).Single(); zzRegion.Name = "Updated by code"; db.Log = Console.Out; Console.ReadLine(); db.SubmitChanges(); In order to raise the ChangeConflictException exception, you need to run the previous code twice. Two console applications are running now. Choose one of them and press a key, and the code will update the database. Then go to the second console, press a key again, and you will generate the exception shown in Figure 18-14.

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If you look carefully at the SQL statement produced by the SubmitChanges method (see Figure 18-14), you will see that the CountryRegionCode, Name, and ModifiedDate columns are used in the WHERE clause. Usually, just the primary key is used in the WHERE condition (in this case, the CountryRegionCode column), because it is sufficient to identify the record. However, in the case of an update operation, the LINQ to SQL framework also checks whether the original record in the database has been changed.

Once it was on the typesetter, I assigned segments of the code to user-defined keys, and producing any grid became no more than a few minutes work By the time my puzzles started appearing in a third magazine (the second already had a gridmaking system in place), I had graduated from the PC-1 to an Amiga (with a Commodore 64 in between) That magazine used Apple Macintosh computers with Adobe Illustrator, so I learned Adobe s page description language, PostScript, and wrote a program in C to generate a PostScript file that I sent to the magazine through a modem PostScript has become the standard printing language in the Unix world (the Macintosh used it from the start, the LaserWriter having a built-in PostScript interpreter) With Ghostscript (gs), printing PostScript files is possible without a PostScript printer With Ghostview (gv), they can be viewed on the screen.

That check is accomplished by providing the record s original values to the query as part of the WHERE condition. If the record was changed, the condition will fail, the database will report no records updated, and the SubmitChanges method raises ChangeConflictException. You can decide which entity s fields participate in concurrency conflict detection using the UpdateCheck property of the Column attribute. You can select from three UpdateCheck values: Never: The column is excluded from the check. Always: A column is always checked. This is the default value. WhenChanged: The column is checked only when its value is changed.

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