Solved 'webrequests' does not exist in the current context

I try this code

Code:

using Oxide.Core;
using Oxide.Core.Libraries;namespace Oxide.Plugins
{
    [Info("EpicPlugin", "Unknown", 1.0)]
    [Description("This example illustrates how to use a GET WebRequest.")]    class TestRequest : RustPlugin
    {
        [ChatCommand("getrequest")]
        void GetRequest(BasePlayer player, string command, string[] args)
        {
            webrequests.EnqueueGet("http://www.google.com/search?q=oxide", (code, response) => GetCallback(code, response, player), this);
        }        void GetCallback(int code, string response, BasePlayer player)
        {
            if (response == null || code != 200)
            {
                Puts("Couldn't get an answer from Google for " + player.displayName);
                return;
            }
            Puts("Google answered for " + player.displayName + ": " + response);
        }
    }
}

But an error during compilation in the console
" The name `webrequests' does not exist in the current context"

What am I doing wrong?
[DOUBLEPOST=1451736199][/DOUBLEPOST]I decided error

Code:

var WebRequestsGet = new WebRequests();
WebRequestsGet.EnqueueGet("http://www.google.com/search?q=oxide", (code, response) => GetCallback(code, response, player), this);