How to Follow the user from Asp.net mvc

[tffau]

First i am using Oauth then to follow a user im RestSharp

string friend = HttpUtility.UrlEncode(item);
var client = new RestClient(“https://www.twitter.com”);
var request = new RestRequest(“https://api.twitter.com/1/friendships/create/” + friend +".xml?follow=true", Method.POST);

            var response = client.Execute(request);

But its not working.