Exception thrown when starting StreamWriter

Question

Every 24 hours, my code auto-generates a .csv-file, writes it temporarily to an Azure directory, and finally deletes it after operating on it.

It succeeds, but from the logs I can see, that an exception is thrown.

Exception:

"The process cannot access the file 'D:\\home\\site\\wwwroot\\myFile.csv' because it is being used by another process."

The log points to these two lines of code, where I simply specify the directory and file-name and then start a StreamWriter:

string filePath = Environment.CurrentDirectory + "\\myFile.csv"; //Specify where to create csv on hosted Azure server (not locally)
using (var w = new StreamWriter(filePath, false, new UTF8Encoding(false))) //Exception is thrown here
{
    //more code
}

I am very confused, how the two above lines can result in that exception, especially since the file is always deleted after upload.

Answer 1

For my particular case, the problem was that the StreamWriter code was executed twice , instead of the intended once . Thanks to user TheGeneral for guiding me in the right direction in the comments.