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Currently the preferred approach. Asynchronous. Ships with .NET 4.5; portable version for other platforms available via NuGet.

using System.Net.Http;
POST

using (var client = new HttpClient())
{
    var values = new Dictionary<string, string>
    {
       { "thing1", "hello" },
       { "thing2", "world" }
    };

    var content = new FormUrlEncodedContent(values);

    var response = await client.PostAsync("http://www.example.com/recepticle.aspx", content);

    var responseString = await response.Content.ReadAsStringAsync();
}
GET

using (var client = new HttpClient())
{
    var responseString = client.GetStringAsync("http://www.example.com/recepticle.aspx");
}