submitform.dart

void _submit() {
     if (this.formKey.currentState.validate()) {
      formKey.currentState.save(); 
     }
    var employee = Employee(firstname,lastname,mobileno,emailId);
    var dbHelper = DBHelper();
    dbHelper.saveEmployee(employee);
    _showSnackBar("Data saved successfully");
}

void _showSnackBar(String text) {
    scaffoldKey.currentState
        .showSnackBar(new SnackBar(content: new Text(text)));
}