using System;

using System.Collections.Generic;

using System.Linq;

public class Program

{

    public static void Main()

    {

        int[] x = new int[] {1, 2, 3, 4, 5, 6, 7, 8}; // <~~~ var retorno = db.retornoDb.Tolist()

        int[] t = new int[] {500, 501, 502, 503};   // <~~~ int[] IdTecnico

        int xn = t.Length;

​

        Dictionary<int, List<int>> tecnicosDivididos = new Dictionary<int, List<int>>();

​

        // inicializa os itens no dicionario

        foreach(int T in t) {

            tecnicosDivididos.Add(T, new List<int>());

        }

​

        for(int i = 0; i < x.Length; i++) {

            int I = i % xn;

            int name = t[I];

            (tecnicosDivididos[name] as List<int>).Add(x[i]);

        }

​

        foreach(KeyValuePair<int, List<int>> item in tecnicosDivididos) {

            Console.WriteLine("{0} => {1}", item.Key, string.Join(", ", item.Value));

        }

    }

}