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using System.IO;
using System.Linq;
 
namespace ConsoleApplication1
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var file1 = "file1";
            var file2 = "file2";
            var file3 = "file3";
            File.WriteAllLines(file3, File.ReadAllLines(file1).Except(File.ReadAllLines(file2)));
        }
    }
}
 

prog.cs(13,18): error CS1502: The best overloaded method match for `System.IO.File.WriteAllLines(string, string[])' has some invalid arguments
/usr/lib/mono/2.0/mscorlib.dll (Location of the symbol related to previous error)
prog.cs(13,18): error CS1503: Argument `#2' cannot convert `System.Collections.Generic.IEnumerable<string>' expression to type `string[]'
Compilation failed: 2 error(s), 0 warnings

Standard output is empty