using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    private class RiskGapsClass

    {

        public readonly int Gmpi;

        public readonly string PatientName;

        public RiskGapsClass(int gmpi, string name)

        {

            this.Gmpi = gmpi;

            this.PatientName = name;

        }

    }

    private class AttestationData

    {

        public readonly int Gmpi;

        public readonly int Year;

        public readonly IEnumerable<RiskGapsClass> Records;

        public AttestationData(int gmpi, int year, IEnumerable<RiskGapsClass> records)

        {

            this.Gmpi = gmpi;

            this.Year = year;

            this.Records = records;

        }

        public override string ToString()

        {

            return (string.Format("Gmpi: {0} Year: {1} Records: {2}",

                this.Gmpi,

                this.Year,

                this.Records.Count()));

        }

    }   

    private static List<RiskGapsClass> _riskGaps = new List<RiskGapsClass>(50)

    {

        new RiskGapsClass(10, "Bob1"),

        new RiskGapsClass(10, "Bob2"),

        new RiskGapsClass(10, "Bob3"),

        new RiskGapsClass(10, "Bob4"),

        new RiskGapsClass(10, "Bob5"),

        new RiskGapsClass(20, "Carol1"),

        new RiskGapsClass(20, "Carol2"),

        new RiskGapsClass(20, "Carol3"),

        new RiskGapsClass(20, "Carol4"),

        new RiskGapsClass(30, "Batman1"),

        new RiskGapsClass(30, "Batman2"),

        new RiskGapsClass(30, "Batman3"),

    };

    public static void Main()

    {

        var processDate = DateTime.Now;

        var riskGaps = new List<RiskGapsClass>(_riskGaps);

        var attData = riskGaps

            .GroupBy(gb => gb.Gmpi)         

            .ToDictionary(

                tdk => tdk.Key,

                tdv => tdv.Select(s => 

                    new AttestationData(

                        s.Gmpi,

                        processDate.Year,

                        tdv.ToList())));

        foreach (var kvp in attData)

        {

            foreach (var item in kvp.Value)

            {

                Console.WriteLine("Key: {0} | Value: {1}", kvp.Key, item);

            }

        }       

    }

}