AddAttachment CSOM SharePoint 2010

AddAttachment to Sharepoint 2010 List item CSOM

Below is the code  to add an attachment to sharePoint 2010 list item through CSOM with WebReference, 

using System;

using System.Collections.Generic;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

using Microsoft.SharePoint.Client;

using System.IO;

using System.Data;

using System.Net;

namespace CSOMFileUpload

{

    class Program

    {

        static void Main(string[] args)

        {

           

            const string listName = "Test";                   

            var credentials = new NetworkCredential("manjunath.soreddy", "MS", "dev");

            var clientContext = new ClientContext("https://spdev.com/TestSite/");

            clientContext.Credentials = credentials;

            var list = clientContext.Web.Lists.GetByTitle(listName);

            var itemCreateInfo = new ListItemCreationInformation();

            var newItem = list.AddItem(itemCreateInfo);

            newItem["Title"] = "Soreddy Client API";

            newItem.Update();

            clientContext.ExecuteQuery();

            clientContext.Load(newItem);

            clientContext.ExecuteQuery();          

            string path = @"c:\OutPutLog.txt";

           

//Here Uploadfile.inv is a Webreference which we have added to SharePoint 2010 Site from Visual Studio to add follow below steps

// Solution Explorer---> Add Service Reference ---> Advanced-> Add Web Reference --> URL

           var refin = new Uploadfile.inv.Lists();

           refin.Credentials = CredentialCache.DefaultCredentials;

           refin.Url = "https://spdev.com/TestSite/");

/_vti_bin/Lists.asmx";

           refin.AddAttachment(listName, newItem["ID"].ToString(), Path.GetFileName(path),

                                      System.IO.File.ReadAllBytes(path));

        }

    }

}

OutPut: