///////////////////////////////////////////////////////////////////////
 public static string run_svn(string args_without_password, string svn_username, string svn_password)
 {
  // run "svn.exe" and capture its output

  System.Diagnostics.Process p = new System.Diagnostics.Process();
  string svn_path = Util.get_setting("SubversionPathToSvn", "svn");
  p.StartInfo.FileName = svn_path;
  p.StartInfo.UseShellExecute = false;
  p.StartInfo.RedirectStandardOutput = true;
  p.StartInfo.RedirectStandardError = true;

  args_without_password += " --non-interactive";
  Util.write_to_log ("Subversion command:" + svn_path + " " + args_without_password);

  string args_with_password = args_without_password;

  if (svn_username != "")
  {
   args_with_password += " --username ";
   args_with_password += svn_username;
   args_with_password += " --password ";
   args_with_password += svn_password;
  }

  p.StartInfo.Arguments = args_with_password;
  p.Start();
  string stdout = p.StandardOutput.ReadToEnd();
  p.WaitForExit();
  stdout += p.StandardOutput.ReadToEnd();

  string error = p.StandardError.ReadToEnd();

  if (error != "")
  {
   Util.write_to_log(error);
   Util.write_to_log(stdout);
  }

  if (error != "")
        {
            string msg = "ERROR:";
            msg += "<div  font-weight: bold; font-size: 10pt;'>";
            msg += "<br>Error executing svn.exe command from web server.";
            msg += "<br>" + error;
            msg += "<br>Arguments passed to svn.exe (except user/password):" + args_without_password;
            if (error.Contains("File not found"))
            {
                msg += "<br><br>***** Has this file been deleted or renamed? See the following links:";
                msg += "<br><a >http://svn.collab.net/repos/svn/trunk/doc/user/svn-best-practices.html</a>";
                msg += "<br><a >http://subversion.open.collab.net/articles/best-practices.html</a>";
                msg += "</div>";
            }
            return msg;
        }
  else
        {
   return stdout;
        }
 }