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Yes, you can use Touchless SDK[^] for webcam and ZXing.NET[^] for QR code. They are both free and open-source. You can also read the article 'WinForm Barcode Reader with Webcam and C#[^]' to learn how to implement a simple QR code reader using Touchless and a .NET barcode SDK.

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The NHibernate ISession instance defines the scope of object identity. The NHibernate ITransaction instance matches the scope of a database transaction. What is the relationship between an ISession and a conversation Let s start this discussion with the most common usage of the ISession. Usually, you open a new ISession for each client request (for example, a web browser request) and begin a new ITransaction. After executing the business logic, you commit the database transaction and close the ISession, before sending the response to the client (see figure 5.2). The session (S1) and the database transaction (T1) Response have the same granularity. If you re not working with Request S1 the concept of conversation, this simple approach is all you need in your application. We also like to call this T1 approach session-per-request. If you need a long-running conversation, you may, Figure 5.2 Using a one-to-one thanks to detached objects (and NHibernate s support ISession and ITransaction for optimistic locking, as discussed in the previous sec- per request/response cycle tion), implement it using the same approach (see figure 5.3). Conversation Suppose your conversation Detached Instances spans two client request/ Request Response Response Request response cycles for example, S1 S2 two HTTP requests in a web application. You can load the interestT1 T2 ing objects in a first ISession and later reattach them to a Figure 5.3 Implementing conversations with multiple new ISession after they ve been ISessions, one for each request/response cycle

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WinForm Barcode Reader with Webcam and C# - Code Pool
Sep 19, 2016 · Create a WinForm barcode reader on Windows with webcam and C#. Use Touchless SDK for webcam and Dynamsoft Barcode Reader SDK ...

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Find out most popular NuGet qrcode Packages. ... QRCoder is a simple library, written in C#.NET, which enables you ... Bytescout Barcode Reader SDK for .NET ...

modified by the user. NHibernate will automatically perform a version check. The time between (S1, T1) and (S2, T2) can be long : as long as your user needs to make his changes. This approach is also known as session-per-request-with-detached-objects. Alternatively, you may prefer to use a single ISession that spans multiple requests to implement your conversation. In this case, you don t need to worry about reattaching detached objects, because the objects remain persistent in the context of the one long-running ISession (see figure 5.4). Of course, NHibernate is still responsible for performing optimistic locking. A conversation keeps a reference to the session, although the session can be serialized, if required. The underlying ADO.NET connection must be closed, of course, and a new connection must be obtained on a subsequent request. This approach is known as session-per-conversation or long session. Usually, your first choice should be to keep the NHibernate ISession open no longer than a single database transaction (session-per-request). Once the initial database transaction is complete, the longer the session remains open, the greater the chance that it holds stale data in its cache of persistent objects (the session is the mandatory first-level cache). Certainly, you should never reuse a single session for longer than it takes to complete a single conversation. The question of conversations Conversation and the scope of the ISession is a matter of application design. We Request Response Request Response discuss implementation strategies S1 with examples in section 10.2. Finally, there is an important T1 T2 issue you may be concerned about. If you work with a legacy Disconnected from ADO.NET Connection database schema, you probably Figure 5.4 Implementing conversations with a long can t add version or timestamp ISession using disconnection columns for NHibernate s optimistic locking.

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Creating A Barcode And QR Code Scanner For Windows Phone 8.1 ...
Sep 21, 2015 · In this article I will show you how write a barcode and QR scanner for Windows Phone 8.1 Runtime Apps.

Other ways to implement optimistic locking If you don t have version or timestamp columns, NHibernate can still perform optimistic locking, but only for objects that are retrieved and modified in the same ISession. If you need optimistic locking for detached objects, you must use a version number or timestamp. This alternative implementation of optimistic locking checks the current database state against the unmodified values of persistent properties at the time the object was retrieved (or the last time the session was flushed). You can enable this functionality by setting the optimistic-lock attribute on the class mapping:

3. Move the two buttons to the right of the Find Items By Name button so that your screen looks like this:

Now, NHibernate includes all properties in the WHERE clause:

update COMMENTS set COMMENT_TEXT='New text' where COMMENT_ID=123 and COMMENT_TEXT='Old Text' and RATING=5 and ITEM_ID=3 and FROM_USER_ID=45

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Use webcam as barcode scanner in C# - Dynamsoft
Feb 4, 2015 · How to Use Webcam as Barcode Reader in C# .... Thus, if you are sure that your customers are using, for instance, QR Code, it's better to ...

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ZXing.Net - CodePlex Archive
This project migrated to https://github.com/micjahn/ZXing.Net. A library which supports decoding and generating of barcodes (like QR Code, PDF 417, EAN, UPC ...

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QR Code Encoder and Decoder .NET(Framework, Standard, Core) Class Library Written in C# (Ver. 2.0.0) The QR Code libraries allows your program to create (encode) QR Code image or, read (decode) an image containing one or more QR Codes .
QR Code Encoder and Decoder .NET(Framework, Standard, Core) Class Library Written in C# (Ver. 2.0.0) The QR Code libraries allows your program to create (encode) QR Code image or, read (decode) an image containing one or more QR Codes .

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