Try/Finally block vs calling dispose?

Question

Is there any difference between these two code samples and if not, why does using exist?

StreamWriter writer;
try {
    writer = new StreamWrite         


        

Answer 1

Is there any difference between these two code samples

Yes, using checks for null before calling Dispose (i.e. the actual code it is expanded to introduces a null check).

why does using exist?

Because the code is more concise. Just a syntactic sugar.