If the requirements change too much, you need to rewrite the entire communication layer using an API which supports whatever mission-critical feature you need.
WCF fixes this problem and more by providing a unified programming model for all the above scenarios so you now just have to learn one API and toolset. It does this by separating the various pieces of communication, E. Rather than worrying about the specifics of how each message is transferred between client and server, WCF just asks you to focus on the service and message contracts.
That is, what methods will you be able to call from a client and the structure of the data returned. All the goo about communication protocols is highly configurable and out of code in the app. We will be creating a three-tiered application called Northwind Traders. Our solution will comprise of four projects: a data access layer, a WCF service, a WinForms client, and a shared business logic component.
Along the way we will highlight key features new to Visual Studio and demonstrate just how easy it is to write killer data-centric apps. Creating Data Access Layer. One of the common problems developing N-tier applications in Visual Studio, is that the tools put the TableAdapters and the typed DataSets in the same project.
Which unfortunately leaks out sensitive information such as connection strings. Add another class library project to your solution called NorthwindBuisnessObjects.
Now, once you build your project, NorthwindDataSet. OnLoad EventArgs e at System. CreateControl at System. VisualBasic Assembly Version: 8. Forms Assembly Version: 2. Drawing Assembly Version: 2. Remoting Assembly Version: 2. Configuration Assembly Version: 2. Xml Assembly Version: 2.
The application must also be compiled with debugging enabled. The Solution is what you look at in Solution Explorer. By default VS will create a solution whenever you create a new project. A Solution is basically a container for multiple projects.
Your project is part of the solution. The dll file needs to be part of the project. Normally if you are using a dll within your project you will add a reference to it via Project Add Reference of via the Project Properties page.
If you do that it gets added automatically to your project solution. If you have referenced the dll some other way then you may need to add it to the project manually by right clicking on the project in Solution Explorer or via Project Add Existing Item.
Visual Studio Blog April 18, Top Bloggers. NET Core. NET Framework Forms XAML. Paste your code snippet. Cancel Ok. Click Visual Studio Express SP1 Beta , and then click Remove In the setup wizard, select the option to uninstall the product, and then follow the setup wizard. How to restore to the release version of Visual Studio After you completely remove all Visual Studio SP1 Beta editions, you must repair the remaining Visual Studio release version to restore all the features that were replaced during the Visual Studio SP1 Beta update.
To restore Visual Studio to a supported release-version state, follow these steps: If any Visual Studio Express SP1 Beta editions were installed, remove them by following the steps in the "How to remove Visual Studio Express SP1 Beta" subsection of the "Removal issues for all platforms" section. Repeat step 3.
Add or remove any feature components that you want to modify. Reinstall any edition of Visual Studio Express. Uninstall the Microsoft. Sixty-four-bit debugger components are not updated on computers that have the release version of Visual Studio Express editions installed The Remote Debugger Light component lets you debug bit applications in Visual Studio Express editions.
To work around this issue, follow these steps: Click Start , click run , type eventvwr. Click to select Application. Check whether the following error exists in the event log: Type: Error Source: System.
Error Unknown namespace or alias AdventureWorksModel. Need more help? Expand your skills. Get new features first. Was this information helpful? Yes No. Thank you!
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