Question

Usually I’d do this:

using (SqlCommand cmd = new SqlCommand("XXXX", cnn))
{
    using (SqlDataReader dr = cmd.ExecuteReader())
    {
        //xxxxxx  
    }
}

Or even this:

using (SqlCommand cmd = new SqlCommand("XXXX", cnn))
using (SqlDataReader dr = cmd.ExecuteReader())
{
    //xxxxxx  
}

But what about this:

using (SqlDataReader dr = new SqlCommand("XXXX", cnn).ExecuteReader())
{
    //xxxxxx  
}

Does that call Dispose() for the SqlCommand, even though I haven’t assigned it to a variable?

Answer 1

Does that call IDisposable for the SqlCommand, even though I haven’t assigned it to a variable?

No. It will call Dispose() on the SqlDataReader (dr), since that is the object returned by the expression.