Home > DeveloperSection > Forums > Handling IDisposables within another IDisposable “using” statement
Babe Zaharias
Babe Zaharias

Total Post:19

Points:133
Posted on    September-28-2013 8:09 AM

 C# C# 
Ratings:


 1 Reply(s)
 875  View(s)
Rate this:
I'm still relatively new to C# and have only within the past several days been exposed to "IDisposables". I can grasp the concept of the using block to take care of objects which must be disposed of without needing to manually remember to call the .Dispose() method - convenient!

Let's say though that I start with a new SqlConnection which I handle within a using statement. Within that block of code I create some additional IDisposables, for example a SqlDataAdapter. Does that adapter need it's own using statement?

For example, if I have code...

using (SqlConnection myConnection = new SqlConnection())
{
    SqlCommand myCommand = new SqlCommand();
    SqlDataAdapter myAdapter = new SqlDataAdapter();
    // Do things
}

... will myCommand and myAdapter be disposed of when myConnection is disposed (since they are within the scope of that code block)? Or do I need multiple using statements, maybe something like:

using (SqlConnection myConnection = new SqlConnection())
{
    using (SqlCommand myCommand = new SqlCommand())
    {
        using (SqlDataAdapter myAdapter = new SqlDataAdapter())
        {
            // Do things
        }
    }
}


Kate Smith
Kate Smith

Total Post:24

Points:168
Posted on    September-28-2013 9:05 AM

Hello Babe!

Using is just syntatic sugar for

            var connection = new Connection();
        try
        {
            connection.DoSomething();
        }
        finally
        {
            // Check for a null resource.
            if (connection != null)
            {
                ((IDisposable)connection).Dispose();
            }
        }

So yes, you need nested using statements to be sure to dispose all of these


Don't want to miss updates? Please click the below button!

Follow MindStick