File Stream C#

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  4. File AppendAllLines Method Appends lines to a file, and then closes the file
using System;
using System.IO;
using System.Linq;
class Program
{
    static string dataPath = @"c:\t.txt";
    static void Main(string[] args)
    {
        var text = from line in File.ReadLines(dataPath)
                   where (line.Contains("a"))
                   select line;
        File.WriteAllLines(@"C:\data.txt", text);
    }
}