Portable Stream writer c#

Question

I'm currently making an app that needs to print out to a text file, I'm having trouble making it portable below is what I have so far

FileStream fs = new FileStream((@"|DataDirectory|\print" + fileName + ".txt"), FileMode.Create, FileAccess.Write);
            using (StreamWriter writer = new StreamWriter(fs))
            {
                    write.write("HelloWorld"
            }

The error comes on the first line saying im using an invalid character, I'm assuming that is because of the |DataDirectory| but other than that I don't know how I'd be able to use it on a user's machine?

Thanks in advance

Answer 1

Revise your first line to the following:

var fs=new FileStream(
       string.Format(@"{0}\print\{1}.txt",
       Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData),
       filename),FileMode.Create,FileAccess.Write);

Answer 2

If you're developing a desktop app, try with this:

string dir = Path.GetDirectory(Assembly.GetExecutingAssembly().Location);
string filename = Path.Combine(dir, "print", filename + ".txt");
FileStream fs = new FileStream(filename,....);