--- title: Using SignalR to broadcast a slide deck | daily.dev description: A hands-on walkthrough builds DeckCast, a sample app that uses SignalR to broadcast slide navigation in real time from a presenter to multiple viewers,... canonical: https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol twitter:card: summary_large_image twitter:site: @dailydotdev og:type: website og:site_name: daily.dev og:title: Using SignalR to broadcast a slide deck | daily.dev og:description: A hands-on walkthrough builds DeckCast, a sample app that uses SignalR to broadcast slide navigation in real time from a presenter to multiple viewers,... og:url: https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol og:image: https://api.daily.dev/og/posts/pr32wlaOL.png og:image:alt: Using SignalR to broadcast a slide deck og:image:width: 1200 og:image:height: 630 og:locale: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # Using SignalR to broadcast a slide deck **[Maarten Balliauw](https://daily.dev/sources/maartenballiauw)** · 11 min read · 0 upvotes · 0 comments ## Summary A hands-on walkthrough builds DeckCast, a sample app that uses SignalR to broadcast slide navigation in real time from a presenter to multiple viewers, including a web client and a console client. The post explains SignalR's Connections and Hubs abstractions, shows how to create a PresentationHub in C# that groups clients by slide deck and pushes showSlide calls to them, and demonstrates wiring up the JavaScript client with Deck.JS as well as a .NET console client using the Task Parallel Library. It closes by noting SignalR's open-source nature and growing client support (including a newly mentioned Objective-C client) as an alternative to polling or WCF-based bidirectional communication. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Questions this post answers ### How do I use SignalR Hubs to broadcast messages to a group of clients instead of all connected clients? Add clients to a named group (such as a slide deck id) inside a hub method like Join using AddToGroup, then call Clients[groupName].methodName(...) to invoke a JavaScript or client-side method only on members of that group. This lets a server push updates, like showSlide, to just the viewers watching a specific presentation rather than every connected client. _daily.dev surfaces practical SignalR patterns for developers building grouped real-time broadcasts._ ### How can a .NET console application connect to a SignalR hub and receive server-pushed events? Create a HubConnection pointed at the server's root URL, call CreateProxy with the hub's full type name, then call connection.Start(). Use presentationHub.On("showSlide", callback) to subscribe to server-pushed events, and presentationHub.Invoke("MethodName", args).Wait() to call hub methods synchronously using the Task Parallel Library. _Developers wiring non-browser clients into SignalR hubs can compare approaches on daily.dev._ ## Similar posts on daily.dev - [Real-Time at Last: SSE and SignalR in ASP.NET Core](https://daily.dev/posts/real-time-at-last-sse-and-signalr-in-asp-net-core-hfyl1qquh) · We Are .NET · 0 upvotes · 0 comments - [Real-Time Angular Gantt Chart with SignalR: Multi-User Project Sync Without Refresh](https://daily.dev/posts/real-time-angular-gantt-chart-with-signalr-multi-user-project-sync-without-refresh-giv3scyc0) · Syncfusion · 0 upvotes · 0 comments - [Real-Time Data Updates with the Telerik UI for .NET MAUI Grid](https://daily.dev/posts/real-time-data-updates-with-the-telerik-ui-for-net-maui-grid-uwef0mkfk) · Telerik · 1 upvotes · 0 comments - [Server-Sent Events in ASP.NET Core and .NET 10](https://daily.dev/posts/server-sent-events-in-asp-net-core-and-net-10-rqln4wisb) · Milan Jovanović · 25 upvotes · 0 comments --- Tags: [#webdev](https://daily.dev/tags/webdev), [#c#](https://daily.dev/tags/c#) [View this post on daily.dev](https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol) ```json {"@context":"https://schema.org","@graph":[{"@type":"Organization","@id":"https://daily.dev/#organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180},"sameAs":["https://twitter.com/dailydotdev","https://github.com/dailydotdev","https://www.linkedin.com/company/daily-dev-ltd"]},{"@type":"WebSite","@id":"https://daily.dev/#website","url":"https://daily.dev","name":"daily.dev","publisher":{"@id":"https://daily.dev/#organization"},"potentialAction":{"@type":"SearchAction","target":{"@type":"EntryPoint","urlTemplate":"https://daily.dev/search?q={search_term_string}"},"query-input":"required name=search_term_string"}}]} {"@context":"https://schema.org","@type":"TechArticle","headline":"Using SignalR to broadcast a slide deck","url":"https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol","mainEntityOfPage":{"@type":"WebPage","@id":"https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol"},"datePublished":"2026-10-04T13:05:29.351Z","dateModified":"2026-10-04T13:07:30.232Z","description":"A hands-on walkthrough builds DeckCast, a sample app that uses SignalR to broadcast slide navigation in real time from a presenter to multiple viewers,...","image":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5ff8a7570bf9b5426a02776db830251d?_a=AQAEuop","thumbnailUrl":"https://media.daily.dev/image/upload/f_auto,q_auto/v1/posts/5ff8a7570bf9b5426a02776db830251d?_a=AQAEuop","isAccessibleForFree":true,"articleSection":"Maarten Balliauw","inLanguage":"en","publisher":{"@type":"Organization","name":"daily.dev","url":"https://daily.dev","logo":{"@type":"ImageObject","url":"https://daily.dev/apple-touch-icon.png","width":180,"height":180}},"author":{"@type":"Organization","name":"Maarten Balliauw","logo":"https://media.daily.dev/image/upload/s--rOTg3VYO--/f_auto,q_auto/v1791119043/logos/maartenballiauw?_a=BAMAMicg0","url":"https://daily.dev/sources/maartenballiauw"},"commentCount":0,"discussionUrl":"https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol","interactionStatistic":[{"@type":"InteractionCounter","interactionType":{"@type":"LikeAction"},"userInteractionCount":0},{"@type":"InteractionCounter","interactionType":{"@type":"CommentAction"},"userInteractionCount":0}],"keywords":"webdev,c#","timeRequired":"PT11M"} {"@context":"https://schema.org","@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Home","item":"https://daily.dev"},{"@type":"ListItem","position":2,"name":"Maarten Balliauw","item":"https://daily.dev/sources/maartenballiauw"},{"@type":"ListItem","position":3,"name":"Using SignalR to broadcast a slide deck"}]} {"@context":"https://schema.org","@type":"FAQPage","@id":"https://daily.dev/posts/using-signalr-to-broadcast-a-slide-deck-pr32wlaol#faq","mainEntity":[{"@type":"Question","name":"How do I use SignalR Hubs to broadcast messages to a group of clients instead of all connected clients?","acceptedAnswer":{"@type":"Answer","text":"Add clients to a named group (such as a slide deck id) inside a hub method like Join using AddToGroup, then call Clients[groupName].methodName(...) to invoke a JavaScript or client-side method only on members of that group. 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