private void btnCreateEmployeeFile_Click(object sender, RoutedEventArgs e)
        {
            List <Employee> employees = JSonReader.ReadJSON("http://dummy.restapiexample.com/api/v1/employees");

            StringBuilder fileContent = new StringBuilder();

            foreach (Employee employee in employees)
            {
                fileContent.Append(employee.ID + "|" + employee.Employee_name + "|" + employee.Employee_salary + "|" + employee.Employee_age + ";");
            }

            SaveFileDialog saveFileDialog = new SaveFileDialog();
            string         folder         = Environment.GetFolderPath(Environment.SpecialFolder.MyDocuments);

            saveFileDialog.FileName = "employees.txt";
            saveFileDialog.Filter   = "Tekstbestand (*.txt)|*.txt|C# bestand (*.cs)|*.cs";
            if (saveFileDialog.ShowDialog() == true)
            {
                folder = System.IO.Path.GetDirectoryName(saveFileDialog.FileName);
                string fileName = System.IO.Path.GetFileName(saveFileDialog.FileName);
                try
                {
                    FileWriter.WriteStringToFile(fileContent.ToString(), folder, fileName);

                    lstEmployees.ItemsSource = employees;
                }
                catch (Exception fout)
                {
                    MessageBox.Show(fout.Message, "ERROR");
                }
            }
        }