Notes

Certainly! Below, I'll provide you with a basic implementation of a C# controller, a model, and Postman for testing the API. Additionally, I'll include sample HTML views for login, registration, and appointment management.

### C# Model (EventModel.cs):

```csharp
public class EventModel
{
public int UserId { get; set; }
public string Username { get; set; }
public string Password { get; set; }
public string Title { get; set; }
public DateTime Date { get; set; }
public string Time { get; set; }
public string Location { get; set; }
public string Description { get; set; }
}
```

### C# Controller (EventController.cs):

```csharp
using System;
using System.Collections.Generic;
using System.Linq;
using Microsoft.AspNetCore.Mvc;

[ApiController]
[Route("[controller]")]
public class EventController : ControllerBase
{
private static List<EventModel> events = new List<EventModel>();
private static int UserIdCounter = 1;

[HttpGet("events")]
public ActionResult<IEnumerable<EventModel>> GetEvents()
{
return Ok(events);
}

[HttpPost("register")]
public ActionResult<int> RegisterUser(EventModel newUser)
{
newUser.UserId = UserIdCounter++;
events.Add(newUser);
return newUser.UserId;
}

[HttpPost("login")]
public ActionResult<int> LoginUser(EventModel user)
{
EventModel authenticatedUser = events.FirstOrDefault(u => u.Username == user.Username && u.Password == user.Password);

if (authenticatedUser != null)
{
return authenticatedUser.UserId;
}
else
{
return NotFound("Invalid credentials.");
}
}

[HttpPost("create-event")]
public ActionResult CreateEvent(EventModel newEvent)
{
// Set UserId for the created event
newEvent.UserId = GetAuthenticatedUserId();
events.Add(newEvent);

return Ok("Event created successfully.");
}

// Helper method to get the authenticated UserId from the session or token
private int GetAuthenticatedUserId()
{
// Replace this with your authentication logic
// For simplicity, assume authentication is done and UserId is stored in the session or token
// In a real-world scenario, use a proper authentication mechanism
// e.g., JWT, OAuth, ASP.NET Identity
return 1; // Sample user id
}
}
```

### Postman:

You can use Postman to test your API endpoints. Below are examples of how to use Postman to interact with your API:

1. **Get Events:**
- Method: GET
- URL: `http://localhost:5000/event/events`

2. **Register User:**
- Method: POST
- URL: `http://localhost:5000/event/register`
- Body (JSON):
```json
{
"Username": "user1",
"Password": "password1"
}
```

3. **Login User:**
- Method: POST
- URL: `http://localhost:5000/event/login`
- Body (JSON):
```json
{
"Username": "user1",
"Password": "password1"
}
```

4. **Create Event:**
- Method: POST
- URL: `http://localhost:5000/event/create-event`
- Body (JSON):
```json
{
"Title": "Meeting",
"Date": "2023-01-01",
"Time": "10:00 AM",
"Location": "Office",
"Description": "Discuss project"
}
```

### HTML View (Login.cshtml):

```html
<!-- Your login HTML form -->
```

### HTML View (Register.cshtml):

```html
<!-- Your registration HTML form -->
```

### HTML View (CreateEvent.cshtml):

```html
<!-- Your create event HTML form -->
```

These HTML views should contain forms to capture user input for login, registration, and event creation. Adjust the URLs in the Postman examples based on your hosting environment.

Remember to handle user authentication securely in a production environment. The provided C# controller is a basic example, and in a real-world scenario, you should use a proper authentication mechanism and potentially a database for persistent data storage.