CORS in ASP.Net MVC with SignalR causes “Access-Control-Allow-Origin” error

I use SignalR (v2.4.0) in an ASP.NET MVC project with Angular 8 and encounter “Access to XMLHttpRequest at ‘https:/demo.com/signalr/negotiate?clientProtocol=2.1&connectionData=’ from origin ‘http://localhost:20700‘ has been blocked by CORS policy: No ‘Access-Control-Allow-Origin’ header is present on the requested resource.” error while debugging (also similar error in PROD stage). I have tried to apply fixes on Setting Access-Control-Allow-Origin…

How to Display Data without a model in Asp.net Mvc?

I m using SqlInjectionQuery with MVC I Insert, update, delete a record in a Database successfully but I want the Display them. I have No model class I create a controller EmptyController: namespace mvccruddatabase.Controllers { public class EmptyController : Controller { StudentEntities db = new StudentEntities(); //static connection SqlConnection cn = new SqlConnection(@”Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename=C:\Users\Perfect\Documents\Student.mdf;Integrated Security=True;Connect…

How can I map a column of a SQL Server table, beginning with a number (name of the column:2DBIT), to an ASP.NET MVC project (stored procedure) CRUD?

I have a table in SQL Server with some columns. I wrote some stored procedures. I have loaded those tables and stored procedures on an ASP.NET MVC project with Visual Studio, with first database. Visual Studio produced the crud for this table, that is working with the default Entity Framework. But my job is to…