using System;

using System.Linq;

using System.Collections.Generic;

using System.Linq.Expressions;

public class Program

{

    public static void Main()

    {

        List<InstituicaoIp> instituicoesIps =

            new List<InstituicaoIp>{ 

                new InstituicaoIp { Ip="1", InstituicaoId=3 },

                new InstituicaoIp { Ip="2", InstituicaoId=3 },

                new InstituicaoIp { Ip="3", InstituicaoId=3 },

                new InstituicaoIp { Ip="4", InstituicaoId=3 } 

        };

​

        if(instituicoesIps != null && instituicoesIps.Count() > 0) {

            IEnumerable<IGrouping<int, string>> query =

                instituicoesIps.GroupBy(instituicaoIp => instituicaoIp.InstituicaoId, instituicaoIp => instituicaoIp.Ip);

            if(query.Count() == 1) {

                //TODO - Va 

            }

        }

        else {

            //TODO - Acesso liberado    

            Console.WriteLine("Acesso Liberado");

        }

        /*

        foreach (IGrouping<string, int> petGroup in query)

        {

            Console.WriteLine(petGroup.Key);

            foreach (int name in petGroup)

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

        }

        */

    }

}

​

class InstituicaoIp

{

    public string Ip { get; set; }

    public int InstituicaoId { get; set; }

}