Authenticating .NET Client Object Model CSOM in Office 365 in SharePoint 2013

Authenticating .NET Client Object Model CSOM in Office 365 in SharePoint 2013
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using Microsoft.SharePoint.Client;

using SP = Microsoft.SharePoint.Client;

using System;

using System.Collections.Generic;

using System.Linq;

using System.Security;

using System.Web;

using System.Web.UI;

using System.Web.UI.WebControls;

namespace WebApplication1

{

    public partial class WebForm1 : System.Web.UI.Page

    {

        protected void Page_Load(object sender, EventArgs e)

        {

            const string webUrl = "https://sreekanth2.sharepoint.com/";

            const string USER = "sreekanth@sreekanth2.onmicrosoft.com";

            const string PWD = "password";

            var listInfo = ""; 

            using (ClientContext clientContext = new ClientContext(webUrl))

            {

                SecureString passWord = new SecureString();

                foreach (char c in PWD.ToCharArray())

                {

                    passWord.AppendChar(c);

                }

                clientContext.Credentials = new SharePointOnlineCredentials(USER, passWord);

                Microsoft.SharePoint.Client.List spList = clientContext.Web.Lists.GetByTitle("Temperature");

                clientContext.Load(spList);

                clientContext.ExecuteQuery();

                if (spList != null && spList.ItemCount > 0)

                {

                    Microsoft.SharePoint.Client.CamlQuery camlQuery = new CamlQuery();

                    camlQuery.ViewXml = @"<View><Query><Where><IsNotNull><FieldRef Name='ID' /></IsNotNull></Where><OrderBy><FieldRef Name='ID' /></OrderBy></Query><ViewFields><FieldRef Name='ID' /><FieldRef Name='City' /><FieldRef Name='Month' /><FieldRef Name='Temperature' /></ViewFields></View>";

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

                    clientContext.Load(listItems);

                    clientContext.ExecuteQuery();

                    listInfo += "<table border='1'><tr><td>ID</td><td>City</td><td>Month</td><td>Temperature</td></tr>";

                    foreach (SP.ListItem oListItem in listItems)

                    {

                        listInfo += "<tr><td>" + oListItem.Id + "</td><td>" + oListItem["City"] + "</td><td>" + oListItem["Month"] + "</td><td>" + oListItem["Temperature"] + "</td></tr>";

                    }

                    listInfo += "</tr></table>";

                    div1.InnerHtml = "List Items found:<br/>" + listInfo;

                }

            }

        }

    }

}

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