Copy Sharepoint list items from one site to another programmatically

Below code explains how to copy list items from one list to another list.I have chosen Console Application template because it doens’t contains any input fields to show as webpart and also to avoid GAC registration, safe controls etc., I felt it will be easy to execute the code in Console.

using System;
using System.Collections.Generic;
using System.Text;

using Microsoft.SharePoint;

namespace CopyListItems
{
    class Program
    {
        static void Main(string[] args)
        {
            try
            {
                SPSite mySourceSite = new SPSite("http://fivenumber:5/");
                SPWeb mySourceWeb = mySourceSite.OpenWeb();
                SPList mySourceList = mySourceWeb.Lists["Source List"];
                SPQuery mySourceListQuery = new SPQuery();
                mySourceListQuery.Query = "" +
                                "" +
                                "" +
                                "" +
                                "";
                SPListItemCollection mySourceItemColl = mySourceList.GetItems(mySourceListQuery);
                int count = 0;
                foreach (SPListItem mySourceListItem in mySourceItemColl)
                {
                    string SourceEmpId = mySourceListItem["Employee Id"].ToString();
                    string SourceEmpName = mySourceListItem["Employee Name"].ToString();
                    string SourceDesig = mySourceListItem["Designation"].ToString();
                    string SourceAge = mySourceListItem["Age"].ToString();

                    SPSite myDestinationSite = new SPSite("http://fivenumber:50");
                    SPWeb myDestinationWeb = myDestinationSite.OpenWeb();
                    SPList myDestinationList = myDestinationWeb.Lists["Destination List"];
                    SPListItem myDestinationListItem = myDestinationList.Items.Add();

                    myDestinationListItem["Employee Id"] = SourceEmpId;
                    myDestinationListItem["Employee Name"] = SourceEmpName;
                    myDestinationListItem["Designation"] = SourceDesig;
                    myDestinationListItem["Age"] = SourceAge;
                    myDestinationWeb.AllowUnsafeUpdates = true;
                    myDestinationListItem.Update();
                    myDestinationWeb.AllowUnsafeUpdates = false;
                    count++;
                    Console.WriteLine(count+" item(s) copied");
                }
                Console.WriteLine("Press enter to continue");
                Console.ReadLine();
            }
            catch (Exception ex)
            {
                Console.Write(ex);
                Console.WriteLine("Press enter to continue");
                Console.ReadLine();
            }
        }
    }
}

If you have Lookup column in your Source List and want to copy the same data in to Destination List, you have to create an instance for SPFieldLookupValue class like below…..

Let’s suppose ‘Employee Name’ column is lookup field, comment or remove the line # 29 in the above code and replace with below code snippet

SPFieldLookupValue mySourceLookupEmpName = new SPFieldLookupValue(mySourceListItem["Employee Name"].ToString());
string SourceEmpName = mySourceLookupEmpName.LookupId.ToString();