Office 365 How to Connect SharePoint Online site using CSOM

Microsoft introduced a new functionality to interact with CSOM. With any interactions with the release, you can call in a class called "SharePointOnlineCredentials" this will handle any authentication you should need to do.

This class is included in version 15 of the Microsoft.SharePoint.Client dll

 

Method

This is a simple way to connect Sharepoint online sites using this method,

var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);

Configure your credentials in a separate configuration class

private class Configuration
        {
  public static string ServiceSiteUrl = "https:// https://gowthamr.sharepoint.com";
  public static string ServiceUserName = "[email protected]";
  public static string ServicePassword = "xxxxxxxxxx";
        }


Create new Context with interating SharePoint Online sites,
static ClientContext GetonlineContext()
        {
            var securePassword = new SecureString();
            foreach (char c in Configuration.ServicePassword)
            {
                securePassword.AppendChar(c);
            }

            var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);

            var context = new ClientContext(Configuration.ServiceSiteUrl);
            context.Credentials = onlineCredentials;

            return context;
        }

Now we will see about Create A SharePoint List using CSOM method,
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using Microsoft.SharePoint.Client;

namespace O365SPCreateList
{
    class Program
    {


     private class Configuration
        {
                public static string ServiceSiteUrl = "https:// https://gowthamr.sharepoint.com";
                public static string ServiceUserName = "[email protected]";
                public static string ServicePassword = "xxxxxxxxxx";
        }

                 static ClientContext GetonlineContext()
                          {
                                    var securePassword = new SecureString();
                                    foreach (char c in Configuration.ServicePassword)
                                    {
                                        securePassword.AppendChar(c);
                                    }
                                    var onlineCredentials = new SharePointOnlineCredentials(Configuration.ServiceUserName, securePassword);
                                    var context = new ClientContext(Configuration.ServiceSiteUrl);
                                    context.Credentials = onlineCredentials;
                                    return context;
                          }


        static void Main(string[] args)
        {
            var ClientContext=GetonlineContext();
            Web web = clientContext.Web;
            ListCreationInformation creationInfo = new ListCreationInformation();
            creationInfo.Title = "CustomList";
            creationInfo.TemplateType = (int)ListTemplateType.GenricList.;
            List list = web.Lists.Add(creationInfo);
            list.Description = "New Description";
            list.Update();
            context.ExecuteQuery();

        }
    }
}

Run this code and check your SharePoint Site.New Site List created Successfully.

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