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Part-6 | .NET 6 Web API | SQL Database | React JS(v18) | CRUD Example

The main objectives of this article are:
  • Create Get By Id Endpoint In API Project.
  • Creating Update Endpoint In API Project.
  • Creating A React Component To Show Update Form

Create Get By Id Endpoint In API Project:

To update any record, we first need to fetch it by its 'id'. So let's create a get id by an endpoint in our API project.
public async Task<IActionResult> Get(int id)
	var villainById = await _reactJSDemoContext
	.SuperVillain.Where(_ => _.Id == id)
	return Ok(villainById);
  • (Line: 2)Since it is a second HTTP Get Action method, so we have to explicitly specify the route.
  • The route expression '{id:int}' represent 'id' value must be integer value.
  • (Line: 5-7) Fetching the record by 'id' from the database.

Create Update Endpoint In API Project:

Let's create the HTTP PUT action method.
public async Task<IActionResult> Put(SuperVillain villainToUpdate)
	await _reactJSDemoContext.SaveChangesAsync();
	return Ok(villainToUpdate);
  • (Line: 1) The 'HttpPut' verb makes our action method can be accessed by the HTTP PUT request.
  • (Line: 2) Here to the action method we are passing our record that needs to be updated. In this payload, the 'id' value should be mandatory.
  • (Line: 4) Using the 'Update' method attach our payload data to the database context.
  • (Line: 5) Using the 'SaveChangesAsync()' method save our changes to the database.

Create A 'UpdateSuperVillain' Component In React App:

Let's create a new react component like 'UpdateSuperVillian' to handle the update form.
function UpdateSuperVillain() {
  return (
export default UpdateSuperVillain;

Configure 'UpdateSuperVillain' Route In App Component:

Let's add routing for the 'UpdateSuperVillain' component in the 'App' component.
import UpdateSuperVillain from "./pages/UpdateSuperVillain";
// existing code hidden for display purpose
function App() {
  return (
          element={<UpdateSuperVillain />}
export default App;
  • Here the route ':id' represents the placeholder for a dynamic 'id' value in the route.

Implement Update Form Logic:

Let's implemented the update form logic in the 'UpdateSuperVillain' component.
import { useRef, useEffect } from "react";
import Form from "react-bootstrap/Form";
import Button from "react-bootstrap/Button";
import axios from "axios";
import { useNavigate, useParams } from "react-router-dom";

function UpdateSuperVillain() {
  const superVillainName = useRef("");
  const franchise = useRef("");
  const powers = useRef("");
  const imgUrl = useRef("");

  const navigate = useNavigate();

  const { id } = useParams();

  useEffect(() => {
    axios.get(`https://localhost:7273/SuperVillain/${id}`).then((response) => {
      superVillainName.current.value =;
      franchise.current.value =;
      powers.current.value =;
      imgUrl.current.value =;
  }, []);

  function updateVillainHandler() {
    var payload = {
      villainName: superVillainName.current.value,
      powers: powers.current.value,
      franchise: franchise.current.value,
      imageUrl: imgUrl.current.value,
      id: id,
      .put(`https://localhost:7273/SuperVillain/`, payload)
      .then((response) => {

  return (
      <legend>Update SuperVilian</legend>
        <Form.Group className="mb-3" controlId="formSuperVillainName">
          <Form.Label>Super Villain Name</Form.Label>
          <Form.Control type="text" ref={superVillainName} />
        <Form.Group className="mb-3" controlId="formFranchise">
          <Form.Control type="text" ref={franchise} />
        <Form.Group className="mb-3" controlId="formPowers">
          <Form.Control as="textarea" rows={3} ref={powers} />
        <Form.Group className="mb-3" controlId="formImgUrl">
          <Form.Label>Image URL</Form.Label>
          <Form.Control type="text" ref={imgUrl} />
      <Button variant="primary" type="button" onClick={updateVillainHandler}>
export default UpdateSuperVillain;
  • (Line: 8-11) Declared the 'useRef' variables which we use to read the form data.
  • (Line: 13) Declared 'navigate' variable of type 'useNavigate()'.
  • (Line: 15) The 'useParams()' loads from the 'react-router-dom' helps to read the dynamic data from the route.
  • (Line: 17-24) Fetching the record to edit based on the 'id' value. To execute this API call only once we pass an empty array as the second parameter to the 'useEffect()'.
  • (Line: 26-39) Invoking the HTTP put API call for updating the record.
  • (Line: 62) The button click event registered with the 'updateVillainHandler' method.

'Edit' Button:

Let's add the 'Edit' button on to the 'AllSuperVillain' component.
// existing code hidden for display  purpose

function AllSuperVillain() {
  return (
      <Row md={3} className="g-4 mt-1">
        { => {
          return (
            <Col key={}>
                    <b>Powers: </b>
                    onClick={() => navigate(`/supervillain-update/${}`)}

export default AllSuperVillain;
  • Here we can see the 'Edit' button click is registered with an arrow function that contains logic to navigate to the 'UpdateSuperVaillain' component
(Step 1)
(Step 3)
In the next article, we will implement the Delete operation.

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Wrapping Up:

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