Release file from RichtextBox LoadFile Method

public EditareArticol(string path,List<capitol>chapters,Object[,]lca)
        {
 this.richTextBoxEx1.LoadFile(path, RichTextBoxStreamType.RichText);

      }


private void saveToolStripButton_Click(object sender, EventArgs e)
        {
richTextBoxEx1.SaveFile("articles\\"+textBox1.Text+".dat",RichTextBoxStreamType.RichText);   
File.SetAttributes("articles\\" + textBox1.Text + ".dat", File.GetAttributes("articles\\" + textBox1.Text + ".dat") | FileAttributes.Hidden);       
        }

try
           {
               WebClient request = new WebClient();
               request.Credentials = new NetworkCredential("lucian", "lucian");
               numefisier = numefisier + ".dat";
               byte[] filedata = request.DownloadData(Path.Combine(adresaserver, "/", "c:/ArticoleAplicatieLicenta/", numefisier));

               if (Directory.Exists("articles"))
               {
                   Console.WriteLine("That path exists already.");

               }
               else
               {
                   DirectoryInfo di = Directory.CreateDirectory("articles");
                   di.Attributes |= FileAttributes.Hidden;
                   di.Attributes &= ~FileAttributes.ReadOnly;
               }

               using (FileStream file = File.Create("articles\\" + numefisier))
               {

                   file.Write(filedata, 0, filedata.Length);
                   file.Close();
               }
               File.SetAttributes("articles\\" + numefisier, File.GetAttributes("articles\\" + numefisier) | FileAttributes.Hidden);

               Console.WriteLine("Download complete");
           }
           catch (Exception ee)
           {
               Console.WriteLine(ee.Message);
               //return false;
           }