Question

I am getting this error: The process cannot access the file (…) because it is being used by another process.
I have tried to use
File.WriteAllText;

StreamWriter sw = new StreamWriter(myfilepath);
                sw.Write(mystring);
                sw.Close();
                sw.Dispose();

;

using (FileStream fstr = File.Create(myfilepath))
                {
                StreamWriter sw = new StreamWriter(myfilepath);
                sw.Write(mystring);
                sw.Close();
                sw.Dispose();
                fstr.Close();
                }

All I am trying to do is to access a file, write on it, then close it. I might be making a silly mistake but I would like to understand what I am doing wrong and why. How to make sure that the file is closed and not to cause this error again.

Helped by the answers so far I did this:

using (FileStream fstr = File.Open(myfilepath,FileMode.OpenOrCreate,FileAccess.ReadWrite))
                {
                    StreamWriter sw = new StreamWriter(fstr);
                    sw.Write(mystring);
                    sw.Close();


                }

It seems to be better because it seems to close/stop the process of my file if I try to access another file on the second time I access the page. But if I try to access the same file on a second time, it gives me the error again.

Answer 1

I would like to thank everyone for the help.
In fact, apart from this code I found out that I had a stremReader still opened somewhere else after the code above. At the end I changed the code I had before for this:

using (FileStream fstr = File.Open(myfile, FileMode.OpenOrCreate, FileAccess.ReadWrite))

                    {
                        StreamWriter sw = new StreamWriter(fstr);
                        sw.Write(mystring);
                        sw.Flush();
                        sw.Dispose();
                    }

and on my StreamReader I did this:

StreamReader sr = new StreamReader(myfile);
string sometext = sr.ReadToEnd();
sr.Dispose();

I could also use this:

File.ReadAllText(myfile);

If there is something that I could have done in a better way please tell me.
Thank you very much.