why i need Activator CreateInstance?

Why i need Activator CreateInstance? i don't need to use create new instance via Activator createInstance can you explain why i need Activator. can you give some advise when i need to use activator.CreateInstance

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection;

namespace App.CreateInstance
{
    class Program
    {
        static void Main(string[] args)
        {

            new MyCustomerManager().Save <MyCustomer>(new object[] { 1, "xxx", "yyyy" });
        }
    }

    public class MyCustomerManager
    {
        public void Save<TModel>(object[] Vals)
        {
            Type calcType = typeof(TModel);
            object instance = Activator.CreateInstance(calcType);
            PropertyInfo[] ColumnNames = instance.GetType().GetProperties();

            for (int i = 0; i < ColumnNames.Length; i++)
            {
                calcType.GetProperty(ColumnNames[i].Name, BindingFlags.Instance | BindingFlags.Public).SetValue(instance, Vals[i], null);
            }

            string result = "";
            for (int i = 0; i < ColumnNames.Length; i++)
            {
                result += String.Format("{0}:{1}", ColumnNames[i].Name, calcType.GetProperty(ColumnNames[i].Name,
                                        BindingFlags.Instance | BindingFlags.Public).GetValue(instance, null).ToString());
            }
            Console.WriteLine(result);
            Console.ReadKey();
        }
    }

    // Model
    public class MyCustomer
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public string SurName { get; set; }
    }
}

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i can do that without Activator.CreateInstance:

using System.Reflection;

namespace App.ReflectionToGeneric4
{
    class Program
    {
        static void Main(string[] args)
        {
            object[] Vals = new object[] { 1, "xxx","yyyy" };
            new MyCustomerManager().Save<MyCustomer>(Vals);
        }
    }

    // Model
    public class MyCustomer
    {
        public int ID { get; set; }
        public string Name { get; set; }
        public string SurName { get; set; }
    }

    public class MyCustomerManager
    {
        public void Save<TModel>(object[] Vals) where TModel : class, new()
        {
            var instance = new TModel();
            Type calcType = instance.GetType();
            PropertyInfo[] ColumnNames = calcType.GetProperties();

            for (int i = 0; i < ColumnNames.Length; i++)
            {
                  calcType.GetProperty(ColumnNames[i].Name,BindingFlags.Instance|BindingFlags.Public).SetValue(instance, Vals[i], null);
            }
            string result = "";
            for (int i = 0; i < ColumnNames.Length; i++)
            {
                result += String.Format("{0}:{1}", ColumnNames[i].Name, calcType.GetProperty(ColumnNames[i].Name, 
                                        BindingFlags.Instance | BindingFlags.Public).GetValue(instance, null).ToString());
            }
            Console.WriteLine(result);
            Console.ReadKey();

        }
    }
}

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why i need create Instance? Can you show me?