How to Create Rest API in ASP?

Harshit Pandey
Sep 16
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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Registration Form</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            background-color: #f4f4f4;
            padding: 20px;
        }
        form {
            background-color: #fff;
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
            width: 300px;
            margin: auto;
        }
        input[type="text"],
        input[type="email"],
        input[type="password"] {
            width: 100%;
            padding: 10px;
            margin: 8px 0;
            border: 1px solid #ccc;
            border-radius: 4px;
            box-sizing: border-box;
        }
        input[type="submit"] {
            background-color: #4CAF50;
            color: white;
            padding: 14px 20px;
            margin: 8px 0;
            border: none;
            border-radius: 4px;
            cursor: pointer;
            width: 100%;
        }
        input[type="submit"]:hover {
            background-color: #45a049;
        }
    </style>
</head>
<body>
    <form action="#" method="POST">
        <h2>Registration Form</h2>
        <label for="fullname">Full Name:</label>
        <input type="text" id="fullname" name="fullname" required>

        <label for="email">Email:</label>
        <input type="email" id="email" name="email" required>

        <label for="password">Password:</label>
        <input type="password" id="password" name="password" required>

        <label for="confirm_password">Confirm Password:</label>
        <input type="password" id="confirm_password" name="confirm_password" required>

        <input type="submit" value="Register">
    </form>
</body>
</html>

Step 1: Set Up the Project

Create a new ASP.NET Core Web API project. You can do this via the .NET CLI or Visual Studio.

Using .NET CLI:

dotnet new webapi -n ProductApi
cd ProductApi

namespace ProductApi.Models
{
    public class Product
    {
        public int Id { get; set; }
        public string Name { get; set; }
        public decimal Price { get; set; }
    }
}

using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using ProductApi.Data;
using ProductApi.Models;

[Route("api/[controller]")]
[ApiController]
public class ProductsController : ControllerBase
{
    private readonly ApplicationDbContext _context;

    public ProductsController(ApplicationDbContext context)
    {
        _context = context;
    }

    // GET: api/Products
    [HttpGet]
    public async Task<ActionResult<IEnumerable<Product>>> GetProducts()
    {
        return await _context.Products.ToListAsync();
    }

    // GET: api/Products/5
    [HttpGet("{id}")]
    public async Task<ActionResult<Product>> GetProduct(int id)
    {
        var product = await _context.Products.FindAsync(id);

        if (product == null)
        {
            return NotFound();
        }

        return product;
    }

    // POST: api/Products
    [HttpPost]
    public async Task<ActionResult<Product>> PostProduct(Product product)
    {
        _context.Products.Add(product);
        await _context.SaveChangesAsync();

        return CreatedAtAction("GetProduct", new { id = product.Id }, product);
    }

    // PUT: api/Products/5
    [HttpPut("{id}")]
    public async Task<IActionResult> PutProduct(int id, Product product)
    {
        if (id != product.Id)
        {
            return BadRequest();
        }

        _context.Entry(product).State = EntityState.Modified;

        try
        {
            await _context.SaveChangesAsync();
        }
        catch (DbUpdateConcurrencyException)
        {
            if (!ProductExists(id))
            {
                return NotFound();
            }
            else
            {
                throw;
            }
        }

        return NoContent();
    }

    // DELETE: api/Products/5
    [HttpDelete("{id}")]
    public async Task<IActionResult> DeleteProduct(int id)
    {
        var product = await _context.Products.FindAsync(id);
        if (product == null)
        {
            return NotFound();
        }

        _context.Products.Remove(product);
        await _context.SaveChangesAsync();

        return NoContent();
    }

    private bool ProductExists(int id)

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