using System;

using System.Linq;

using System.Collections.Generic;

​

public class Simple {

  public static void Main() {

    List<DistpackageDto> distPck = new List<DistpackageDto>()

                { 

                  new DistpackageDto { FK_DistPackageTypeCode = "RG", UnitsInPackage = 22, RetailPackageType ="lg",RetailPackageNumber =101,Weight = 3.00m },

                  new DistpackageDto { FK_DistPackageTypeCode = "RG", UnitsInPackage = 22, RetailPackageType ="lg",RetailPackageNumber =101,Weight = 2.00m }

                };

       var distpack = distPck

                .GroupBy(x => new { x.FK_DistPackageTypeCode, x.RetailPackageNumber, x.RetailPackageType, x.UnitsInPackage })

                .Select((x) => new DistpackageDto

                {

                    FK_DistPackageTypeCode = x.Key.FK_DistPackageTypeCode,

                    ItemCode = 1753,

                    RetailPackageNumber = x.Key.RetailPackageNumber,

                    RetailPackageType = x.Key.RetailPackageType,

                    UnitsInPackage = x.Key.UnitsInPackage,

                    Weight = x.Max(k => k.Weight),

                }).ToList();

      foreach(var d in distpack)

      {

          Console.WriteLine(d.ItemCode + " " + d.Weight);

      }

​

  }

}

​

public class DistpackageDto

{

    public string FK_DistPackageTypeCode { get; set; }

    public int UnitsInPackage { get; set; }

    public string RetailPackageType { get; set; }

    public Int16 RetailPackageNumber { get; set; }

    public decimal Weight { get; set; }

    public int ItemCode {get;set;}

}