foreach (string readfile in openFileDialog1.FileNames)
            {
                string completepath = Path.GetFullPath(readfile);
                StreamReader sr = new StreamReader(completepath, Encoding.Default, true, 1024);
                StringBuilder filetosave = new StringBuilder();
                string text = sr.ReadToEnd();
                filetosave.Append(text);
                string finalfile = filetosave.ToString();
                File.AppendAllText(saveto + "\\combined.txt", finalfile.ToUpper(), Encoding.Default);
                sr.Close();
                sr.Dispose();
 
            }