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ADO.NET Series - Connecting with a Database
While working with databases the first thing you need to do is to connect with a database. In this part of the series of articles, we will see how to use SqlConnection class to connect with SQL server database.
Following code snippet shows how you can open and close a database connection.
Sample1 s1=new Sample1();
//create a new sql connection
//add StateChange event handler
("Press any key to open
("Press any key to close
Here, we created an instance of SqlConnection class and pass connection string to it from appSettings section of application configuration file. Next, we add an event handler to the StateChange event. This event gets fired when the connection changes its state from Open to Close and vice a versa.
public void OnStateChange
(object src ,StateChangeEventArgs e)
("State changed from " +
e.OriginalState + " to " +
The event handler simply prints the previous state to the console. We then open the connection using Open() method. We then simply close it by calling Close() method.
In this part of the series of articles, we saw how to open and close a database connection. We also saw how to detect the state change of the connection. In the next article we will see how to retrieve records from database table using DataReader class.