title: Return file from web-api cause error "Could not find file"
body: <p>I am trying to return file from my web api and I got <code>System.IO.FileNotFoundException Could not find file</code>.</p>
  
  <p>I can read the byte array like this: <code>System.IO.File.ReadAllBytes(csvPath);</code></p>
  
  <p>but when I am returning file with the same path like this: <code>return File(csvPath, "text/csv", "data.csv");</code></p>
  
  <p>It's throwing <code>System.IO.FileNotFoundException Could not find file</code></p>