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public class Commons
{        
  public bool CreateDir(string dirname)          
  {            
    try
    {
      using (var sftp = new SftpClient(MainForm.WebHosting.Host, MainForm.WebHosting.UserName, MainForm.WebHosting.Pw))
      {
        string rootdir = @"/home/gustav/";
        sftp.Connect();
        sftp.ChangeDirectory(rootdir);
        sftp.CreateDirectory(dirname);
        sftp.Disconnect();
      }
    }
    catch (Exception ex)
    {                    
       MessageBox.Show("Compilermeldung: " + ex.Message);
       return false;        
    }
    return true;
  }
}