Using C# to get content from URL followed by this error "WebRequest does not contain a definition for GetRespone and ..."

This code comes from Microsoft's documentation. I put this code in a Console app and a Windows Form app separately.

In the Console app, there is an error : “WebRequest does not contain a definition for GetRespone and …”

But in the Windows Form app, there is no error.

I really don't know why this happen. I am a beginner of C#, so this question may be stupid. But I feel very confused. Please explain to me. Thank you!

Below are two screenshots for these two situation:

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Here is the code.

using System;
using System.IO;
using System.Net;

namespace ConsoleApp1
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create a request for the URL.   
            WebRequest request = WebRequest.Create(
              "http://www.contoso.com/default.html");
            // If required by the server, set the credentials.  
            request.Credentials = CredentialCache.DefaultCredentials;
            // Get the response.  
            WebResponse response = request.GetResponse();
            // Display the status.  
            Console.WriteLine(((HttpWebResponse)response).StatusDescription);
            // Get the stream containing content returned by the server.  
            Stream dataStream = response.GetResponseStream();
            // Open the stream using a StreamReader for easy access.  
            StreamReader reader = new StreamReader(dataStream);
            // Read the content.  
            string responseFromServer = reader.ReadToEnd();
            // Display the content.  
            Console.WriteLine(responseFromServer);
            // Clean up the streams and the response.  
            reader.Close();
            response.Close();
        }
    }
}