---
title: "How can you broadcast a message to all connected clients in SignalR?"  
description: "How can you broadcast a message to all connected clients in SignalR?"  
author: "Utpal Vishwas"  
published: 2025-05-21  
updated: 2025-05-21  
canonical: https://www.mindstick.com/interview/34153/how-can-you-broadcast-a-message-to-all-connected-clients-in-signalr  
category: "c#"  
tags: ["c#", "signalr", "chat", "chat app"]  
reading_time: 3 minutes  

---

# How can you broadcast a message to all connected clients in SignalR?

Broadcasting a message to **all connected clients** in SignalR is straightforward and one of its core features.

### How to broadcast to all clients in a SignalR Hub?

Inside your Hub class on the server, you use:

```cs
await Clients.All.SendAsync("MethodName", parameters...);
```

1. `Clients.All` targets **every connected client**.
2. `"MethodName"` is the name of the client-side method that will be invoked.
3. `parameters...` are the data you want to send.

### Example: Broadcasting a chat message to everyone

```cs
public class ChatHub : Hub
{
    public async Task SendMessage(string user, string message)
    {
        // Broadcast to all connected clients
        await Clients.All.SendAsync("ReceiveMessage", user, message);
    }
}
```

### On the client side, you listen for `"ReceiveMessage"`:

```javascript
connection.on("ReceiveMessage", (user, message) => {
    console.log(`${user}: ${message}`);
    // Update UI or perform actions with the message
});
```

### Summary

| Action | Code snippet |
| --- | --- |
| Broadcast message | `await Clients.All.SendAsync("ReceiveMessage", user, message);` |
| Listen on client | `connection.on("ReceiveMessage", handlerFunction);` |

## Read More

- [What is SignalR and how does it work in real-time web applications?](https://www.mindstick.com/interview/34149/what-is-signalr-and-how-does-it-work-in-real-time-web-applications)
- [How do you set up a basic SignalR Hub in an ASP.NET Core application?](https://www.mindstick.com/interview/34150/how-do-you-set-up-a-basic-signalr-hub-in-an-asp-dot-net-core-application)
- [What are the different transport protocols SignalR can use for communication?](https://www.mindstick.com/interview/34151/what-are-the-different-transport-protocols-signalr-can-use-for-communication)
- [How do clients connect to a SignalR Hub and send messages?](https://www.mindstick.com/interview/34152/how-do-clients-connect-to-a-signalr-hub-and-send-messages)

## Answers

### Answer by Utpal Vishwas

Broadcasting a message to **all connected clients** in SignalR is straightforward and one of its core features.

### How to broadcast to all clients in a SignalR Hub?

Inside your Hub class on the server, you use:

```cs
await Clients.All.SendAsync("MethodName", parameters...);
```

1. `Clients.All` targets **every connected client**.
2. `"MethodName"` is the name of the client-side method that will be invoked.
3. `parameters...` are the data you want to send.

### Example: Broadcasting a chat message to everyone

```cs
public class ChatHub : Hub
{
    public async Task SendMessage(string user, string message)
    {
        // Broadcast to all connected clients
        await Clients.All.SendAsync("ReceiveMessage", user, message);
    }
}
```

### On the client side, you listen for `"ReceiveMessage"`:

```javascript
connection.on("ReceiveMessage", (user, message) => {
    console.log(`${user}: ${message}`);
    // Update UI or perform actions with the message
});
```

### Summary

| Action | Code snippet |
| --- | --- |
| Broadcast message | `await Clients.All.SendAsync("ReceiveMessage", user, message);` |
| Listen on client | `connection.on("ReceiveMessage", handlerFunction);` |

## Read More

- [What is SignalR and how does it work in real-time web applications?](https://www.mindstick.com/interview/34149/what-is-signalr-and-how-does-it-work-in-real-time-web-applications)
- [How do you set up a basic SignalR Hub in an ASP.NET Core application?](https://www.mindstick.com/interview/34150/how-do-you-set-up-a-basic-signalr-hub-in-an-asp-dot-net-core-application)
- [What are the different transport protocols SignalR can use for communication?](https://www.mindstick.com/interview/34151/what-are-the-different-transport-protocols-signalr-can-use-for-communication)
- [How do clients connect to a SignalR Hub and send messages?](https://www.mindstick.com/interview/34152/how-do-clients-connect-to-a-signalr-hub-and-send-messages)


---

Original Source: https://www.mindstick.com/interview/34153/how-can-you-broadcast-a-message-to-all-connected-clients-in-signalr

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