Uncaught Error: SignalR: Error loading hubs. Ensure your hubs reference is correct, e.g. <script src='/signalr/js'></script>.
    at Object.start (jquery.signalR-2.4.0.min.js:9)
    at HTMLDocument.<anonymous> (Default.aspx:716)
.......


hubs:1 Failed to load resource: net::ERR_CONNECTION_TIMED_OUT

 $.connection.hub.start().done(function ()

WPF allows you to build modern desktop applications for Windows, and part of building an application is debugging code and optimizing performance. In Alessandro Del Sole’s WPF Debugging and Performance Succinctly, you will learn how to debug a WPF application by leveraging all the powerful tools in Visual Studio, including the most recent additions that allow you to investigate the behavior of the UI at runtime. Also, you will learn how to analyze and improve an application’s performance in order to provide your customers with the best possible experience and thereby make them happy.

• Validate arguments from events.
• Validate inputs and results from JS interop calls.
• Avoid using (or validate beforehand) user input for .NET to JS interop calls.
• Prevent the client from allocating an unbound amount of memory.
• Data within the component.
• DotNetObject references returned to the client.
• Guard against multiple dispatches.
• Cancel long-running operations when the component is disposed.
• Avoid events that produce large amounts of data.
• Avoid using user input as part of calls to NavigationManager.NavigateTo and validate user input for URLs against a set of allowed origins first if unavoidable.
• Don't make authorization decisions based on the state of the UI but only from component state.
• Consider using Content Security Policy (CSP) to protect against XSS attacks.
• Consider using CSP and X-Frame-Options to protect against click-jacking.
• Ensure CORS settings are appropriate when enabling CORS or explicitly disable CORS for Blazor apps.
• Test to ensure that the server-side limits for the Blazor app provide an acceptable user experience without unacceptable levels of risk.