registertofb.dart

  void registerToFb() {
    firebaseAuth
        .createUserWithEmailAndPassword(
            email: emailController.text, password: passwordController.text)
        .then((result) {
      dbRef.child(result.user.uid).set({
        "email": emailController.text,
        "age": ageController.text,
        "name": nameController.text
      }).then((res) {
        Navigator.pushReplacement(
          context,
          MaterialPageRoute(builder: (context) => Home(uid: result.user.uid)),
        );
      });
    }).catchError((err) {
      showDialog(
          context: context,
          builder: (BuildContext context) {
            return AlertDialog(
              title: Text("Error"),
              content: Text(err.message),
              actions: [
                TextButton(
                  child: Text("Ok"),
                  onPressed: () {
                    Navigator.of(context).pop();
                  },
                )
              ],
            );
          });
    });
  }