Удалить загруженный файл из физического пути C#

I am trying to upload a file .When file is uploaded, I take some  information from it and then i want to delete it.

I manage to upload it, save it and get the info from it, but when i try to delete it i get the follwing exception "The process cannot access the file 'C:\Data\UploadedDocuments\81741092055.pdf' because it is being used by another process."

<pre>public async Task<IActionResult> SendMaillNewsLetter(IFormFile file,string subject,string fileName,string message)
        {
            

            tempGuid = Guid.NewGuid();
            ContactUs objUserContactUs = new ContactUs();
            var fileSavePath = _configuration.RootPath + fileName;
            if (file.Length > 0)
            {
                using (var stream = new FileStream(fileSavePath, FileMode.Create))
                {
                    await file.CopyToAsync(stream);
                }
            }

            List<string> NewsletterSubscriptionList = new List<string>();
            NewsletterSubscriptionList = _UserModel.GetNewsletterSubscriptionList(NewsletterSubscriptionList);
            if(NewsletterSubscriptionList.Count>0)
            {
                
                foreach (string item in NewsletterSubscriptionList)
                {
                    _emailSender.SendEmail(item, "", subject, message, fileSavePath);
                }

                             

                if (System.IO.File.Exists(fileSavePath))
                {
                    try
                    {
                        System.IO.File.Delete(fileSavePath);
                    }
                    catch (Exception ex)
                    {

                    }
                }

            }
            return Ok(new { objUserContactUs });
        }