Access to the path .... is denied

Question

I have created a .msi by using VS2008 setup project. My application frequently writes some value in a .txt file in the application directory (C:\Program Files\MyApp\MyFile.txt). After insalling it in Win7, it raises an exception "Access to the path .... is denied."

But whenever I run it as administrator, no such exception occurs. Here is my sscce

string FilePath=Application.StartupPath + @"\AppSettings\CurrentUserName.inf";
using (StreamWriter writer=new StreamWriter(FilePath,false))
{
    writer.Write(txtLoginName.Text.Trim());
}
MainForm.ProcessLogIn();
this.DialogResult = DialogResult.OK;

I don't know how to solve this problem. Any suggestion?

Answer 1

The only way to solve this problem is to not write to that folder. You are not allowed to write to that folder by convention, unfortunately, older versions of Windows did not hold you to this.

Instead, you can use Environment.SpecialFolder to help you find where you need to go:

// your application data for just that User running the app
var perUserAppData = Environment.GetFolderPath(
    Environment.SpecialFolder.ApplicationData);

// your application data for ALL users running the app
var allUsersAppData = Environment.GetFolderPath(
    Environment.SpecialFolder.CommonApplicationData);

// better!
var path = Path.Combine(perUserAppData, @"MyApp\MyFile.txt");

Basically, Windows 7 is telling you that you're going to have to stop driving on the sidewalks and use the street as was intended.