C# rewrite Restsharp old version program

[zydjohn]

Hello:

I found some RestSharp Code, it was written in .NET 4.5 and it seems working on a web page hosts the program. Now I am using .NET 4.7.1 with C# 7.2, I am using Visual Studio 2017, but the code is not compiled. The following is the code:

namespace ConsoleApplication3
{
using System;
using System.Threading;

using RestSharp;

public class Program
{
public static async void Main()
{
var client = new RestClient();
var request = new RestRequest("Google");
var cancellationTokenSource = new CancellationTokenSource();

var restResponse = await client.ExecuteTaskAsync(request, cancellationTokenSource.Token);

Console.WriteLine(restResponse.Content.Length);
}
}
}

The compiler error:

Severity Code Description Project File Line Suppression State
Error CS5001 Program does not contain a static 'Main' method suitable for an entry point ConsoleApplication3

But for its original web hosting page: C# Online Compiler | .NET Fiddle

It seems it is working. I want to know how to port it to .NET Framework 4.7.1 or 4.7.2

Its syntax seem to be a little different from what I see most of other C# programs.

Thanks,

PS: I used nuget to install RestSharp:

PM> Install-Package RestSharp -Version 106.3.1

Continue reading...