.NET Tip: Managing Resources with the Using Statement

Last week, I showed you how you can help ensure that your objects release their resources by implementing IDisposable. This week, I want to show you the using statement that allows you to specify when your objects release their resources. Objects declared in the using statement will explicitly be disposed when the end of the using block is reached. I often use nested using statements for data access to precisely control the creation and disposal of my objects. Here is how you can take advantage of the using statement to create a database connection, create a command, and execute a data reader to access your data.

using (SqlConnection CN =
   new SqlConnection("*** Your connection string here ***"))
{
   CN.Open();
   using (SqlCommand cmd =
          new SqlCommand("SELECT * FROM authors", CN))
   {
      using (SqlDataReader dr = cmd.ExecuteReader())
      {
         // Access elements items here
      }
   }
}

By nesting the using statements above, you can be sure you are creating objects only when necessary and that, once everything is finished, your objects will all be disposed of in a timely manner. If an error should occur anywhere along the way, any objects created up to that point will still be disposed of when the using block is exited. The only caveat is that the object declared in the using statement must implement the IDisposable interface. Keep this in mind if you plan on taking advantage of the using statement with your own classes.

About the Author

Jay Miller is a Software Engineer with Electronic Tracking Systems, a company dedicated to robbery prevention, apprehension, and recovery based in Carrollton, Texas. Jay has been working with .NET since the release of the first beta and is co-author of Learn Microsoft Visual Basic.NET In a Weekend. Jay can be reached via email at jmiller@sm-ets.com.



Comments

  • There are no comments yet. Be the first to comment!

Leave a Comment
  • Your email address will not be published. All fields are required.

Top White Papers and Webcasts

  • Live Event Date: October 29, 2014 @ 11:00 a.m. ET / 8:00 a.m. PT Are you interested in building a cognitive application using the power of IBM Watson? Need a platform that provides speed and ease for rapidly deploying this application? Join Chris Madison, Watson Solution Architect, as he walks through the process of building a Watson powered application on IBM Bluemix. Chris will talk about the new Watson Services just released on IBM bluemix, but more importantly he will do a step by step cognitive …

  • Live Event Date: October 28, 2014 @ 1:00 p.m. ET / 10:00 a.m. PT The Financial Services industry is a target today like never before, as attackers leverage different techniques to breach and exploit IT security. In recent months, there have been a number of high profile data breaches and attacks that have impacted the Financial Services industry. By examining the recent attacks, several key trends emerge about what attackers are targeting and how organizations can bolster their defenses. Join us for this …

Most Popular Programming Stories

More for Developers

Latest Developer Headlines

RSS Feeds