Compiling error c#
<p>I have a amount of code that compiles in visual studio, however in a different ide it doesn't compile. </p>

<p>the error that is returned is System.IO file does not contain a defintion for "ReadLines".</p>

<p>i am using system.io</p>

<p>the section of the code that appears with an eror is ReadLines.</p>

<p>could anybody offer a soultion? </p>

<pre><code>using System;
using System.IO;                      // enable the user of different sections of the .net framework 
using System.Linq;
using System.Collections.Generic;
namespace HashTagAssignment
{
    class HashTag
    {
        static void Main(string[] args)
        {
            string tweets = File.ReadAllText(@"F:\tweets.txt"); // Retrives Text from file and loads into console
            {
                Console.WriteLine(tweets); // writes contense to console
                {
                    var lineCount = File.ReadAllLines(@"F:\tweets.txt").Length; // counts number of lines in the whole document
                    Console.WriteLine("Number of Lines:{0}", lineCount); // displays answer
                    {
                        var result = File.ReadLines(@"F:\tweets.txt").Distinct().Count(); // search txt file for Distinct enteries and implement counter. 
                        Console.WriteLine(" Number of Unique Tags: {0}", result); // display result of counter 
                        {
                            Console.WriteLine(" Top Twenty By Number:"); // Title Top twenty hash tags, with order they occured in left colum. 
                            Console.WriteLine(); // creates a line space 
                            var rank = File // assigns varible to a file 
                        .ReadLines(@"F:\tweets.txt") // directs to file, in this case text
                      .GroupBy(x =&gt; x)
    .Select(g =&gt; new { Key = g.Key, Count = g.Count() })
    .OrderByDescending(i =&gt; i.Count)
    .Take(20);
                            foreach (var item in rank)
                            {
                                Console.WriteLine("{0} {1}", item.Count, item.Key);
                            }
                            {
                                {
                                }
                                Console.ReadKey(true);
                            }
                        }
                    }
                }
            }
        }
    }
}
</code></pre>
