/// <summary>
        /// Author: Caitlin Abelson
        /// Created Date: 1/30/19
        ///
        /// The btnSave_Click method is used for saving a new employee or updating
        /// an existing employee in the system.
        /// </summary>
        private void btnSave_Click(object sender, RoutedEventArgs e)
        {
            if (btnSave.Content.Equals("Submit"))
            {
                if (!ValidateInput())
                {
                    return;
                }



                _newEmployee = new Employee()
                {
                    FirstName    = txtFirstName.Text,
                    LastName     = txtLastName.Text,
                    Email        = txtEmail.Text,
                    PhoneNumber  = txtPhone.Text,
                    DepartmentID = cbxDepartment.SelectedItem.ToString()
                };
                Role role = new Role();
                role.RoleID = cbxEmployeeRole.SelectedItem.ToString();
                _newEmployee.EmployeeRoles.Add(role);
                try
                {
                    if (_oldEmployee == null)
                    {
                        _employeeManager.InsertEmployee(_newEmployee);
                        Employee employeeExtra = _employeeManager.RetrieveEmployeeIDByEmail(_newEmployee.Email);
                        _employeeManager.AddEmployeeRole(employeeExtra.EmployeeID, _newEmployee.EmployeeRoles[0]);
                        MessageBox.Show("Employee Created: " +
                                        "\nFirst Name: " + _newEmployee.FirstName +
                                        "\nLast Name: " + _newEmployee.LastName +
                                        "\nEmail: " + _newEmployee.Email +
                                        "\nPhone Number: " + _newEmployee.PhoneNumber +
                                        "\nDepartment: " + _newEmployee.DepartmentID);
                    }
                    else
                    {
                        _newEmployee.Active = (bool)chkActive.IsChecked;
                        _employeeManager.UpdateEmployee(_newEmployee, _oldEmployee);
                        SetError("");
                        _employeeManager.RemoveEmployeeRole(_oldEmployee.EmployeeID, _oldEmployee.EmployeeRoles[0]);
                        _employeeManager.AddEmployeeRole(_oldEmployee.EmployeeID, _newEmployee.EmployeeRoles[0]);
                        MessageBox.Show("Employee update successful: " +
                                        "\nNew First Name: " + _newEmployee.FirstName +
                                        "\nNew Last Name: " + _newEmployee.LastName +
                                        "\nNew Phone Number: " + _newEmployee.PhoneNumber +
                                        "\nNew Email: " + _newEmployee.Email +
                                        "\nNew DepartmentID: " + _newEmployee.DepartmentID +
                                        "\nOld First Name: " + _oldEmployee.FirstName +
                                        "\nOld Last Name: " + _oldEmployee.LastName +
                                        "\nOld Phone Number: " + _oldEmployee.PhoneNumber +
                                        "\nOld Email: " + _oldEmployee.Email +
                                        "\nOld DepartmentID: " + _oldEmployee.DepartmentID);
                    }
                }
                catch (Exception ex)
                {
                    SetError(ex.Message);
                }

                Close();
            }
            else if (btnSave.Content.Equals("Update"))
            {
                editableForm();
            }
        }