using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        Dictionary<string, List<FirstReportsData>> dict1 = new Dictionary<string, List<FirstReportsData>>();

        dict1.Add("00", new() { new() { Id = 0 },  new() { Id = 1 },  new() { Id = 2 },  new() { Id = 3 },  new() { Id = 4 } });

        dict1.Add("01", new() { new() { Id = 0 },  new() { Id = 1 },  new() { Id = 2 } });

        dict1.Add("02", new() { new() { Id = 0 },  new() { Id = 1 },  new() { Id = 2 },  new() { Id = 3 },  new() { Id = 4 },  new() { Id = 5 } });

        //if you only want 1 spefic key

        if (dict1.TryGetValue("00", out var values))

        {

            var firstHalf = values.Take(values.Count / 2);

            var secondHalf = values.Skip(values.Count / 2);

            Console.WriteLine("First Half of 00");

            foreach (var item in firstHalf)

                Console.WriteLine(item.Id);

            Console.WriteLine("Second Half of 00");

            foreach (var item in secondHalf)

                Console.WriteLine(item.Id);

        }

        Console.WriteLine();

        Console.WriteLine();

        //if you want to split everything into two new dictionaries

        var fisrtHalfDict = dict1.ToDictionary(x => x.Key, x => new List<FirstReportsData>(x.Value.Take(x.Value.Count / 2)));

        var secondHalfDict = dict1.ToDictionary(x => x.Key, x => new List<FirstReportsData>(x.Value.Skip(x.Value.Count / 2)));

        Console.WriteLine("First Half Dict");

        foreach (var keyValue in fisrtHalfDict)

        {

            Console.WriteLine($"Entries of {keyValue.Key}");

            foreach (var item in keyValue.Value)

                Console.WriteLine(item.Id);

        }

        Console.WriteLine("Second Half Dict");

        foreach (var keyValue in secondHalfDict)

        {

            Console.WriteLine($"Entries of {keyValue.Key}");

            foreach (var item in keyValue.Value)

                Console.WriteLine(item.Id);

        }

        Console.WriteLine();

        Console.WriteLine("Read a specific item in the new dicts");

        Console.WriteLine();

        //get firstHalf of 00

        if (fisrtHalfDict.TryGetValue("00", out var firstHalfList))

        {

            Console.WriteLine("First Half of 00");

            foreach (var item in firstHalfList)

                Console.WriteLine(item.Id);

        }

        //get secondHalf of 00

        if (secondHalfDict.TryGetValue("00", out var secondHalfList))

        {

            Console.WriteLine("Second Half of 00");

            foreach (var item in secondHalfList)

                Console.WriteLine(item.Id);

        }

    }

}

​

public class FirstReportsData

{

  public FirstReportsData() { }

​

  public int    Id { get; set; }

  public int    FirstReportsItemId { get; set; }

  public string Policy { get; set; }

  public string CarrierCode { get; set; }

  public string StateCode { get; set; }

  public string RecordTypeCode { get; set; }

  public string RecordData { get; set; }

}