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There are other lifetime issues to bear in mind. In some situations, an object context may hold database connections open. And also, if you have a long-lived object context, you may need to add calls to Refresh to ensure that you have fresh data, which you wouldn t have to do with a newly created object context. So all the signs suggest that you don t want to keep the object context around for too long. How long is too long In a web application, if you create an object context while handling a request (e.g., for a particular page) you would normally want to Dispose it before the end of that request keeping an object context alive across multiple requests is typically a bad idea. In a Windows application (WPF or Windows Forms), it might make sense to keep an object context alive a little longer, because you might want to keep entities around while a form for editing the data in them is open. (If you want to apply updates, you normally use the same object context you used when fetching the entities in the first place, although it s possible to detach an entity from one context and attach it later to a different one.) In general, though, a good rule of thumb is to keep the object context alive for no longer than is necessary. rdlc upc-a UPC-A Generator DLL for VB.NET Class - Generate Barcode in VB ...
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Net is a port of ZXing, an open-source, multi-format 1D/2D barcode image ..... Linear, Postal, MICR & 2D Barcode Symbologies - ReportViewer RDLC and . The last data access feature we ll look at is slightly different from the rest So far, we ve seen how to write code that uses data in a program that can connect directly to a database But WCF Data Services lets you present data over HTTP, making data access possible from code in some scenarios where direct connections are not possible It defines a URI structure for identifying the data you d like to access, and the data itself can be represented in either JSON or the XML-based Atom Publishing Protocol (AtomPub) As the use of URIs, JSON, and XML suggests, WCF Data Services can be useful in web applications Silverlight cannot access databases directly, but it can consume data via WCF Data Services And the JSON support means that it s also relatively straightforward for script-based web user interfaces to use. rdlc upc-a Packages matching RDLC - NuGet Gallery
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Draw and Print Dynamic UPC-A / UPC-A Supplement 2/5 Add-On in Report Definition Language Client-side/ RDLC Report | Free to download trial package ... The file contains configuration files for both rndc and named. The configuration file for named is in the commented section below the line # End of rndc.conf and will be ignored by rndc when it is run. You will remove the commented named configuration file and put it into another file called named.conf. Using your text editor, cut the lines starting from # Use with the following in named.conf, adjusting the allow list as needed: until # End of named.conf Put those lines in a new text file called named.conf inside the /var/named/chroot/etc directory and save it. We will focus on this file later. rdlc upc-a Linear Barcodes Generator for RDLC Local Report | .NET program ...
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In the following guide we'll create a local report ( RDLC file) which features barcoding capabilities by using Bytescout Barcode SDK. Follow these steps:. WCF Data Services is designed to work in conjunction with the Entity Framework You don t just present an entire database over HTTP that would be a security liability Instead, you define an Entity Data Model, and you can then configure which entity types should be accessible over HTTP, and whether they are read-only or support other operations such as updates, inserts, or deletes And you can add code to implement further restrictions based on authentication and whatever security policy you require (Of course, this still gives you plenty of scope for creating a security liability You need to think carefully about exactly what information you want to expose) To show WCF Data Services in action, we ll need a web application, because it s an HTTP-based technology. If you create a new project in Visual Studio, you ll see a Visual C# Web category on the left, and the Empty ASPNET Web Application template will suit our needs here We need an Entity Data Model to define what information we d. After you ve done that, the rndc.conf file should look like Listing 11-7. like to expose for this example, we ll use the same EDM we ve been using all along, so the steps will be the same as they were earlier in the chapter. To expose this data over HTTP, we add another item to the project under the Visual C# Web template category we choose the WCF Data Service template. We ll call the service MyData. Visual Studio will add a MyData.svc.cs file to the project, which needs some tweaking before it ll expose any data it assumes that it shouldn t publish any information that we didn t explicitly tell it to. The first thing we need to do is modify the base class of the generated MyData class it derives from a generic class called DataService, but the type argument needs to be filled in Visual Studio just puts a comment in there telling you what to do. We will plug in the name of the object context class: This class contains an InitializeService method to which we need to add code for each entity type we d like to make available via HTTP. Example 14-21 makes all three entity types in the model available for read access. public static void InitializeService(IDataServiceConfiguration config) { config.SetEntitySetAccessRule("Customers", EntitySetRights.AllRead); config.SetEntitySetAccessRule("SalesOrderHeaders", EntitySetRights.AllRead); config.SetEntitySetAccessRule("SalesOrderDetails", EntitySetRights.AllRead); } The extension LAN example in the previous section is not the only time to use virtualization Some other uses include systems development, clustering, and security by isolation If you develop systems and you use application libraries that can tap the low-level instructions of your computer, you could freeze your system and lose your current data, which will cost you time and possibly require you to reinstall your system to continue your work With virtualization, you can copy your development system and paste backup copy if your current copy goes down Then too, when you are administering a high-availability server cluster, such as a web server cluster, you will have to set up two or three computers to provide redundancy for that service Those computers can be combined into a single computer with virtualization Those separate computers for the web server cluster will become separate instances inside the single computer.
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