using System;

using System.Net.Http;

using System.Threading.Tasks;

​

public class Program

{

    public Task DoStuff()

    {

        var tcs = new TaskCompletionSource();

        _client.Ready += () =>

        {

            client_Ready("test");

            tcs.SetResult();

        };

        return tcs.Task;

    }

​

    public static async Task Main()

    {

    }

}