asp.net core qr code reader

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In ASP.NET 2.0 and beyond, the total size of the page is about 20 KB. The view state alone, though, takes up about 11 KB. If you port the same page back to ASP.NET 1.x, results are even worse. The whole page amounts to 28 KB, while the view state alone amounts to a burdensome 19 KB. Two conclusions can be drawn from these numbers:

For exam ple, y our code m ight giv e v isit ors one or t wo at t em pt s t o ent er an e- m ail address in a valid form at and t hen accept t he row so long as t he phone num ber and URL v alues ar e in a valid form at Figu re 1 1 - 2 9 Th e Re gu la rEx pr ession V alidat or con t r ol for Ph on e valu e s block ing t h e en t r y of a r ow ..

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Once these procedures are completed, you should have a server that is ready (or nearly ready) for its role in a production environment. For certain, quite a bit of extra work is involved beyond installing the operating system, but these postinstallation procedures are not only important, they re essential to ensuring the server performs as well as can be expected. As a final note, don t make the server available to users until any and all additional needed components, services, and applications are installed on it. The installation of these additional components, services, and applications could require one or more reboots or might require several time periods in which users are blocked from accessing the server or are requested not to connect to it. Remember, from the users perspective, it s usually better to not have a resource than to be given one and then have it taken away (even temporarily). Finalize the server, then deploy it, and you ll have happier users.

You can improve performance in a mulitprocessor server environment by using multiple data files in your database. By using multiple secondary data files, you can take advantage of SQL Server s multithreaded architecture because it will use one thread per database file to perform concurrent I/O operations. There is no point, from a performance point of view, in creating more files than the number of processors available on the server, taking into account any affinity settings, because SQL Server allocates only enough threads, up to the number of processors for the I/O operations. So how large should database data files be One tip I commonly suggest is limiting database file to the capacity of current CD/DVD technology. For example, if you limit your primary database file and secondary database file to 4.7 GB you can easily burn them onto DVDs for offsite backup purposes or for shipping databases to a remote site for attaching. With larger databases, you could obviously take advantage of new technology such as DVD+/-DL, Blue-Ray and HD-DVD.

SELECT * FROM Publishers WHERE PubId IN (SELECT TOP 4 PubId FROM Publishers WHERE PubId < 19 ORDER BY PubId DESC) ORDER BY ISBN

Using the DataReader object couldn t be simpler: you invoke its Read method to advance to the next row in the resultset and check its return value to see whether you have more results (if True) or are at the end of the resultset (if False). Because of this double function, you can create tight loops based on the DataReader object:

Records the number of bytes of physical memory available to processes running on the server. When there is less than 5 percent of memory free, the system is low on memory and performance can suffer. The server might page excessively to disk to try to keep up with resource demands. Memory is critically short if

When writing a module (including ASP.NET pages), you should never throw an exception as an instance of the System.Exception class. It is strictly recommended that you try to use built-in exception types such as InvalidOperationException, NullReferenceException, and ArgumentNullException whenever these types apply. You should resist the temptation of having your very own exceptions all the way through, although for program errors you should consider defining your own exceptions.

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