how to create .txt file and write it c# asp.net

Question

I am trying create and write to a text file in a C# application using the following code

System.IO.Directory.CreateDirectory(Server.MapPath("~\\count"));

using (System.IO.FileStream fs = new System.IO.FileStream("~/count/count.txt", System.IO.FileMode.Create))
using (System.IO.StreamWriter sw = new System.IO.StreamWriter("~/count/count.txt"))
{
    sw.Write("101");
}

string _count = System.IO.File.ReadAllText("~/count/count.txt");
Application["NoOfVisitors"] = _count;

but I get an error:

The process cannot access the file 'path' because it is being used by another process.

What is my error?

Answer 1

You're trying to open the file twice; your first using statements creates a FileStream that is not used, but locks the file, so the second using fails.

Just delete your first using line, and it should all work fine.

However, I'd recommend replacing all of that with File.WriteAllText, then there would be no using in your code, it'd be much simpler.

var dir = Server.MapPath("~\\count");
var file = Path.Combine(dir, "count.txt");

Directory.CreateDirectory(dir);
File.WriteAllText(file, "101");

var _count = File.ReadAllText(file);
Application["NoOfVisitors"] = _count;