Question

How to take care of multiple objects getting disposed off in a Using statement?

Sample code

using(MyClass obj = new MyClass())
{
    MyOtherClass objOC= new MyOtherClass()
    TextReader objTR = new StringReader(...);  
    // other code
}

MyClass obj will be be disposed at the end of the Using block, but then what about
MyOtherClass objOC and TextReader objTR. As far as I know it they wont get disposed, so should I be having a nested Using block there, like this below? I will need a real wide screen monitor if the number of objects increase

Is this below correct?

using(MyClass obj = new MyClass())
{
    using (MyOtherClass objOC= new MyOtherClass())
    {
        using (TextReader objTR = new StringReader(...))
        {
           //code using all three objects 
        }   
    } 
    // other code using just `MyClass obj`
}

MyClass & MyOtherClass both implement IDisposable

Answer 1

Yes, your code is correct. Here’s a couple other things you might want to be aware of…

You can declare multiple objects of the same type in a single using statement. From the documentation:

using (Font font3 = new Font("Arial", 10.0f), 
            font4 = new Font("Arial", 10.0f))
{
    // Use font3 and font4.
}

For using multiple objects of different types you can nest using the one-line syntax to save space:

using (MyClass obj = new MyClass())
using (MyOtherClass objOC= new MyOtherClass())
using (TextReader objTR = new StringReader(...))
{
    // code using all three objects 
}