StreamWriter writer = null;
                    StringBuilder strbuilder = null;
                    string dir = Application.StartupPath;
                    if (!Directory.Exists(dir))
                    {
                        Directory.CreateDirectory(dir);
                    }


                    string path = Path.Combine(dir, "test.csv");
                    strbuilder = new StringBuilder();
                    strbuilder.Append("n");
                    foreach (var a in listofuser)
                    {

                        strbuilder.Append(a.SystemUserID.ToString() + "," + a.FullName.ToString() + "," + a.Department.ToString() +","+ Environment.NewLine);

                    }


                    writer = new StreamWriter(path, true);
                    writer.Write(strbuilder);
                    writer.Close();