Why ASP.Net Core 7.0 Web API showing as Connection refused?

I am new to asp.net core 7.0.

I am working on the Web Api. However I created one controller with [ApiController] decoration.

In the launchSettings.json file it shows port number as 14023 as shown below :-

"iisSettings": {
  "windowsAuthentication": false,
  "anonymousAuthentication": true,
  "iisExpress": {
    "applicationUrl": "http://localhost:14023",
    "sslPort": 44381
  }

Means that my Web API will be pointing to http://localhost:14023

However when I run the application and navigate to http://localhost:14023 it shows below error :

This site can’t be reached

localhost refused to connect.

ERR_CONNECTION_REFUSED

And when I hit the same API URL through Postman then below error coming :-

Error: connect ECONNREFUSED 127.0.0.1:14023

Initially I thought that it could be related to CORS so I added below code in Program.cs file :-

builder.Services.AddCors();

app.UseCors(options =>
options.AllowAnyOrigin()
.AllowAnyMethod()
.AllowAnyHeader()
);

Can anyone help me on this?

I am stuck. Even I googled but did not find any suitable answer.