Get Files from localstorage and download via click

public async Task<string> GetFilesAsync()
        {
            /// when bytearray need to be write to localfile
            //string localfileName = "C:\\logs\\Report.pptx";
            //File.WriteAllBytes(localfileName, byteArray);

/// when read file and convert to memory stream
            MemoryStream ms = new MemoryStream();
            string localfileName = "C:\\logs\\Report.pptx";
            using (FileStream file = new FileStream(localfileName, FileMode.Open, FileAccess.Read))
            {
                file.CopyTo(ms);
            }

            await _azureRepository.SaveFileAsync(ms, "Report_.pptx");

            var result = await _azureRepository.GetFileAsync("Report_.pptx");
/// when on click file need to be downloaded
            if (result != null)
            {
                string fileName = "Report_" + DateTime.Now.ToString("ddmmyyyyhhmmss") + ".pptx";
                HttpContext context = System.Web.HttpContext.Current;
                context.Response.Clear();
                context.Response.AddHeader("content-disposition", String.Format("attachment;filename={0}", fileName));
                result.WriteTo(context.Response.OutputStream);
                result.Close();
                context.Response.End();
                return fileName + "downloaded for ";
            }
            return "No File";
        }