How to create and write file in C#

try
            {
                string _FilePath = Path.Combine(Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData), "log.txt");
                string _oldData = string.Empty;
                TextWriter _objTextWriter = new StreamWriter(_FilePath, true);
                _objTextWriter.WriteLine(DateTime.Now.ToString("dd MMM yyyy hh:mm:ss tt") + "         " + _errorText + Environment.NewLine);
                _objTextWriter.Close();
            }
            catch { }