Structure Package
        Public Company As String
        Public Weight As Double
    End Structure

    Sub SumEx1()
        ' Create a list of Package values.
        Dim packages As New List(Of Package)(New Package() _
             {New Package With {.Company = "Coho Vineyard", .Weight = 25.2}, _
              New Package With {.Company = "Lucerne Publishing", .Weight = 18.7}, _
              New Package With {.Company = "Wingtip Toys", .Weight = 6.0}, _
              New Package With {.Company = "Adventure Works", .Weight = 33.8}})

        ' Sum the values from each item's Weight property.
        Dim totalWeight As Double = packages.Sum(Function(pkg) _
                                                     pkg.Weight)

        ' Display the result.
        MsgBox("The total weight of the packages is: " & totalWeight)
    End Sub

    ' This code produces the following output:
    '
    ' The total weight of the packages is: 83.7

            class Package
            {
                public string Company { get; set; }
                public double Weight { get; set; }
            }

            public static void SumEx1()
            {
                List<Package> packages =
                    new List<Package> 
                        { new Package { Company = "Coho Vineyard", Weight = 25.2 },
                          new Package { Company = "Lucerne Publishing", Weight = 18.7 },
                          new Package { Company = "Wingtip Toys", Weight = 6.0 },
                          new Package { Company = "Adventure Works", Weight = 33.8 } };

                double totalWeight = packages.Sum(pkg => pkg.Weight);

                Console.WriteLine("The total weight of the packages is: {0}", totalWeight);
            }

            /*
             This code produces the following output:

             The total weight of the packages is: 83.7
            */