Creating a HelloWorld WebAPI Project in Asp.Net Core

Open Visual Studio 2017
Create a new Project of type Asp.Net Core Web Application

Select the API template

Project will get created with the following files

Open the ValuesController, replace the default code with the following code.

    [Route("api/[controller]")]

    [ApiController]

    public class ValuesController : ControllerBase

    {

        // GET api/values

        [HttpGet]

        public ActionResult<string> Get()

        {

            string strValue = "Hello Web API";

            return strValue;

        }

         }

Build and run the project, the following will be displayed in the browser.