![]() ![]() When your application tries to open a connection to the database, your application must have access to the connection string. The group box and the label controls add clarity but aren't used in the code. For each control, set the properties that the tables describe. ![]() Visual Studio creates the project and several files, including an empty Windows form that's named Form1.Īdd two Windows forms to your project so that it has three forms, and then give them the following names:įor each form, add the text boxes, buttons, and other controls that appear in the following illustrations. The database also contains four simple stored procedures.Ĭreate a C# or Visual Basic project using the Windows Forms App (.NET Framework) template, and then name it SimpleDataApp. These tables contain no data initially, but you can add data when you run the application that you create. The database contains two tables: Customer and Orders. Paste the T-SQL script into the query editor, and then choose the Execute button.Īfter a short time, the query finishes running and the database objects are created. Right-click on the Sales data connection and select New Query.Ĭopy the Sales Transact-SQL script to your clipboard. The empty Sales database is created and added to the Data Connections node in Server Explorer. In the New database name text box, enter Sales, then choose OK. In the Server name text box, enter (localdb)\mssqllocaldb. Right-click on Data Connections and choose Create New SQL Server Database. In Visual Studio, open the Server Explorer window. Set up the sample databaseĬreate the sample database by following these steps: If you aren't comfortable with these tasks, we suggest that you complete the Create a Windows Forms app in Visual Studio with Visual Basic tutorial or the Create a Windows Forms app in Visual Studio with C# tutorial before you start this walkthrough. This topic assumes that you're familiar with the basic functionality of the Visual Studio IDE and can create a Windows Forms application, add forms to the project, put buttons and other controls on the forms, set properties of the controls, and code simple events. If you don't have SQL Server Express LocalDB, you can install it from the SQL Server download page. The complete code for this tutorial can be accessed in the Visual Studio docs GitHub repo in C# and Visual Basic. If your application needs to modify data in nontrivial ways and update the database, you should consider using Entity Framework and using data binding to automatically sync user interface controls to changes in the underlying data. This article demonstrates a simple way to quickly get data out of a database. NET data technologies-including datasets, LINQ to SQL, and Entity Framework-ultimately perform steps that are very similar to those shown in this article. By following this topic, you can discover how to interact with a database from within a simple Windows Forms "forms over data" application by using Visual C# or Visual Basic and ADO.NET. When you create an application that manipulates data in a database, you perform basic tasks such as defining connection strings, inserting data, and running stored procedures. Entity Framework provides a more natural way to work with tabular data as object models, and it has a simpler programming interface. NET applications use Entity Framework Core. Although datasets have proven to be a very successful technology, we recommend that new. They are especially useful for applications that enable users to modify data and persist the changes back to the database. NET Framework technologies from the early 2000s that enable applications to work with data in memory while the applications are disconnected from the database. For more information, see Using Statement.Datasets and related classes are legacy. This example uses a Using block to make sure that the application closes the port even if it throws an exception. For more information, see How to: Show Available Serial Ports. This example assumes the computer is using COM1 for more flexibility, the code should allow the user to select the desired serial port from a list of available ports. This example assumes the computer is using COM1.The WriteLine method sends the data to the serial port. All code that manipulates the serial port should appear within this block or within a block. The Using block allows the application to close the serial port even if it generates an exception. For more information, see OpenSerialPort. Use the My. method to obtain a reference to the port. You may need to use a different serial port on your computer. This example sends a string to the COM1 serial port. This topic describes how to use My.Computer.Ports to send strings to the computer's serial ports in Visual Basic. ![]()
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