c# create barcode image Note The CLR doesn t require that value types define any constructors . However, this is a in .NET

Writer Quick Response Code in .NET Note The CLR doesn t require that value types define any constructors . However, this is a

Note In ASP.NET 1.x, it is common practice to make DataGrid controls
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using System; using System.Diagnostics; using System.Reflection;
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Here, CompareExchange changes the NewMail reference to null if it is null and does not alter NewMail if it is not null . In other words, CompareExchange doesn t change the value in NewMail at all, but it does return the value inside NewMail in an atomic, thread-safe way . See 28, Primitive Thread Synchronization Constructs, for more information about the Thread.VolatileRead and Interlocked . CompareExchange methods . While the fourth version of this code is the best, technically correct version, you can actually use the second version because the just-in-time (JIT) compiler is aware of this pattern and it knows not to optimize away the local temp variable . Specifically, all of Microsoft s JIT compilers respect the invariant of not introducing new reads to heap memory and therefore, caching a reference in a local variable ensures that the heap reference is accessed only once . This is not documented and, in theory, it could change, which is why you should use the fourth version . But in reality, Microsoft s JIT compiler would never embrace a change that would break this pattern because too many applications would break .1 In addition, events are mostly used in single-threaded scenarios (Windows Forms, Windows Presentation Foundation, and Microsoft Silverlight) and so thread safety is not an issue anyway . It is very important to note that due to this thread race condition, it is also possible that a method will be invoked after it has been removed from the event s delegate chain . As a convenience, you could define an extension method (as discussed in 8, Methods ) that encapsulates this thread-safety logic . Define the extension method like this:
Figure 23-7 If you hae enabled System Protection on multiple disks, you can use this screen to select the disks you want to restore.
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There is a big assumption being made with the code above: no errors occur . But, of course, errors are always possible, and so we need a way to handle those errors . This is what the exception handling constructs and mechanisms are all about and why we need them as opposed to having methods that return true/false to indicate success/failure the way that Win32 and COM functions do . In addition to code composability, we are productive due to all kinds of great features provided by our compilers . For example, the compiler implicitly:
The ConvertIList method specifies two type parameters in which the T parameter is constrained by the TBase type parameter . This means that whatever type argument is specified for T, the type argument must be compatible with whatever type argument is specified for TBase . Here is a method showing some legal and illegal calls to ConvertIList:
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One such situation is when you need to insert or modify large volumes of data and, for practical reasons, you split it into batches, modifying one subset of the data at a time. For example, purging historic data might involve deleting millions of rows of data. Unless the target table is partitioned and you can simply drop a partition, the purging process requires a DELETE statement. Deleting such a large set of rows in a single transaction has several drawbacks. A DELETE statement is fully logged, and it will require enough space in the transaction log to accommodate the whole transaction. During the delete operation (which can take a long time), no part of the log from the oldest open transaction up to the current point can be overwritten. Furthermore, if the transaction breaks in the middle for some reason, all the activity that took place to that point will be rolled back, and this will take a while. Finally, when many rows are deleted at once, SQL Server might escalate the individual locks held on the deleted rows to an exclusive table lock, preventing both read and write access to the target table until the DELETE is completed. It makes sense to break the single large DELETE transaction into several smaller ones small enough to avoid lock escalation (typically, a few thousand rows per transaction) and to allow recycling of the transaction log. You can easily verify that the number you chose doesn t cause lock escalation by testing a DELETE with the TOP option while monitoring Lock
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