Is the using var always executed?

Question

In some code that I maintain, I came across this:

int Flag;
using (StreamReader reader = new StreamReader(FileName, Encoding.GetEncoding("iso-8859-1"), true))
{
    Flag = 1;
    // Some computing code
}

if(Flag == 1)
{
    // Some other code
}

Which, from what I understand, is a way to do some other instruction if the using part was executed. But is there a possibility for using to be not executed (Except if an exception is raised)? Or is this completely useless code?

Answer 1

That code is useless...

If you add a try... catch it could have a sense... You want to know if/where an exception happens, like:

int flag = 0;

try
{
    using (StreamReader reader = new StreamReader(FileName, Encoding.GetEncoding("iso-8859-1"), true))
    {
        flag = 1;

        reader.ReadToEnd();
        flag = 2;
    }

    flag = int.MaxValue;
}
catch (Exception ex)
{

}

if (flag == 0)
{
    // Exception on opening
}
else if (flag == 1)
{
    // Exception on reading
}
else if (flag == 2)
{
    // Exception on closing
}
else if (flag == int.MaxValue)
{
    // Everything OK
}