using System;

using System.Collections.Generic;

using System.Linq;

​

public class Test 

{

    public int? A {get; set;}

    public string B {get; set;}

};

​

public class Program

{

        public static string CleanPathName(string originalPathName)

        {

            var cleanedPathName = originalPathName

                .Replace(@".", "_").Replace(@"}", "_").Replace(@"{", "_")

                .Replace(@"|", "_").Replace(@"/", "_")

                .Replace(@"?", "_").Replace(@">", "_").Replace(@"<", "_")

                .Replace(@"%", "_").Replace(@"#", "_").Replace("\"", "_")

                .Replace(@"~", "_").Replace(@":", "_").Replace(@"*", "_")

                .Replace(@"&", "_");

            return System.Text.RegularExpressions.Regex.Replace(cleanedPathName, @"\+", m => m.Value.Length == 1 ? "" : m.Value);

        }

    public static void Main()

    {   

        List<int> a = new List<int>() {1,2,3};

        List<int> b = new List<int>() {1,2,3,4,5,6,7};

        //var inComon = a.Intersect(b).Any();

        //var result = a.All(s => b.Contains(s));

        List<Test> c = new List<Test>() {

            new Test {

                A = 1,

                B = "A" 

            },

            new Test {

                A = 1,

                B = "B" 

            },

            new Test {

                A = 2,

                B = "C" 

            },

            new Test {

                A = 3,

                B = "D" 

            },

            new Test {

                A = 3,

                B = "E" 

            },

            new Test {

                B = "F" 

            },

            new Test {

                B = "G" 

            },

        };

        var grouping = c.GroupBy(g => g.A);

        foreach (var petGroup in grouping)

            {

            // Print the key value of the IGrouping.

            Console.WriteLine(petGroup.Key);

            // Iterate over each value in the

            // IGrouping and print the value.

            foreach (Test name in petGroup)

                Console.WriteLine("  {0}", name.B);

        }

        Guid dropAreaId;

        string tttt = null;

        Console.WriteLine(tttt);

        var ttt = Guid.TryParse(null, out dropAreaId);

        if ("TEST" == "test")

        {

            Console.WriteLine("YES");

        } else {

            Console.WriteLine("NO");

        }

        var TestString = "1";

        var TestStringconv = TestString.Split(';');

        Console.WriteLine(TestStringconv.Any());

        Console.WriteLine(TestStringconv[0]);

        var TES = TestStringconv.Select(id => (int.Parse(id))+1);

        foreach (var TESs in TES)

        {

            Console.WriteLine(TESs);

        }

        Console.WriteLine("---------");

        var fileIds = new int[] {1,2,3};

        var r = string.Join(";", fileIds);

        Console.WriteLine(r.Count());

        Console.WriteLine("---------");

        var notExcluded = fileIds.Except(new int[]{2});

        foreach (var TESs in notExcluded)

        {

            Console.WriteLine(TESs);

        }   

        Console.WriteLine("---------");

        Console.WriteLine(CleanPathName(@"Test\Test2\Test3\tes"));

        Console.WriteLine("Hello World");

        //Console.WriteLine(result);

    }

}