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- #HOW TO CONNECT SQL SERVER DATABASE IN VB NET 2010 UPDATE#
- #HOW TO CONNECT SQL SERVER DATABASE IN VB NET 2010 CODE#
The choice is fairly simple because it depends on the back-end data source your application needs to communicate with. The first step is to decide which type of connection object to create.
#HOW TO CONNECT SQL SERVER DATABASE IN VB NET 2010 CODE#
When you do not want to use the visual tools previously described and need to create your connections manually, it is easy to create connection objects in code programmatically. Creating Connection Objects Programmatically
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In addition to creating a configured connection object, the Data Source Configuration Wizard allows you to select the database objects you want to use in your application. When you run the Data Source Configuration Wizard and select the database path, you end up with a configured connection object ready to use in your application. The main wizard for bringing data into an application is the Data Source Configuration Wizard. Visual Studio provides a few wizards that simplify the process of creating applications that access data and that create data connections as a result of completing the wizards. Of course, you can create data connections as part of the development process from within an open project, but that is covered in the next section. Data connections created in Server Explorer are user-specific settings in Visual Studio that display the connections each time you open Visual Studio (instead of creating connections as part of developing a specific application that stores them in that application). In other words, you can create data connections in Server Explorer and access them in any project. To simplify the process of creating applications that access data, Visual Studio provides the Server Explorer window as a central location to manage data connections independent of any actual projects. Essentially, connection objects provide a conduit for sending commands to a database and retrieving data and information into your application, as shown in Figure 5-1.įigure 5-1 Connection objects are your application’s communication pipeline to a database Creating Connections in Server Explorer Although connection objects typically can be thought of as the place where you set your connection string, they have additional methods for working with the connection, such as methods that open and close connections, as well as methods for working with connection pools and transactions. It is merely the pipeline through which commands and queries send their SQL statements and receive results.
#HOW TO CONNECT SQL SERVER DATABASE IN VB NET 2010 UPDATE#
The easiest way to describe a connection object is, first, to explain what a connection object is not! A connection object does not fetch or update data, it does not execute queries, and it does not contain the results of queries. DataContext takes a connection string.ĭataContext db = new Get a typed table to run queries.Ĭonsole.WriteLine("id = ", cust.CustomerID,ĭim db As New Northwind(".\Northwnd.mdf")Ĭonsole.WriteLine("id=" & cust.Configure a connection to a database using the Server Explorer.Ĭonfigure a connection to a database using the Data Source Configuration Wizard.Ĭonfigure a connection to a database using the Connection class.Ĭonnect to a database using specific database connection objects.Įstimated lesson time: 30 minutes What Is a Connection Object?Ī connection object is simply a representation of an open connection to a data source. In the following example, the DataContext is used to connect to the Northwind sample database and to retrieve rows of customers whose city is London.
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For more information, see Security in LINQ to SQL. Maintaining a secure connection is of the highest importance.