Compare two list with out using linq for update History

Hi i’m working on a project written in c# webform and it requere loghistory of changes if some one updated the data i should be inserted to logs table but i need to capture which column or which field is being update.
so i think comparing 2 list the oldList before update and the list after update
if i have this class

public myClass class{
public string col1{get; set;}
public string col2{get; set;}
public string col3{get; set;}
}

and list like this with datas

List<myClass > old = new List<myClass >();
List<myClass > new = new List<myClass >();

how can i compire this 2 and get the column and the old and new data of the difference with out using Linq because the application is a existing and uses .net 2.0 framework so i belive Linq is not availavle yet in this.

I’m not requered to update the framwork for some reason.

Answers:

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Method 1

Implement IComparable interface in your class

public class myclass : IComparable<myclass>
        {
            public string col1 { get; set; }
            public string col2 { get; set; }
            public string col3 { get; set; }

            public int CompareTo(myclass obj)
            {
                return this.col1.CompareTo(obj.col1);
            }
        }

Then sort your list and iterate through it

            oldlist.Sort();
            newlist.Sort();
            for (int i = 0; i < oldlist.Count; i++)
            {
                string oldcol1 = oldlist[i].col1;
                string newcol1 = newlist[i].col1;
            }

All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0