Update Shared Document Custom Fields Using Client Object Model in SharePoint 2010

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using Microsoft.SharePoint.Client;

using SP = Microsoft.SharePoint.Client;

namespace MYItemUpdate

{

    class Program

    {

        static void Main(string[] args)

        {

            getfiles();

        }

        private static void getfiles()

        {

            ClientContext clientContext = new ClientContext("http://server-sp:6677/sites/HRDocuments/");

            clientContext.Credentials = new System.Net.NetworkCredential("username1", "pass@1234","myDomineName1");

            List list = clientContext.Web.Lists.GetByTitle("Shared Documents");

            CamlQuery camlQuery = new CamlQuery();

            camlQuery.ViewXml = @"<View Scope='Recursive'></View>";

            camlQuery.FolderServerRelativeUrl = "/sites/HRDocuments/Shared Documents/Pay Slips";

            SP.ListItemCollection listItems = list.GetItems(camlQuery);

            clientContext.Load(listItems);

            clientContext.ExecuteQuery();

            SP.ListItem itemOfInterest = listItems[0];

            Console.WriteLine(itemOfInterest["Employee_x0020_ID"].ToString());

            itemOfInterest["Employee_x0020_ID"] = "66";

            itemOfInterest.Update();

            clientContext.ExecuteQuery();

            listItems = list.GetItems(camlQuery);

            clientContext.ExecuteQuery();

        }

    }

}