Azure Document DB Retrieve data show in Gridview

Step 1: Add web config.

<appSettings>
   <add key="EndPointUrl" value="your end url" />
   <add key="AuthorizationKey" value=" your AuthorizationKey" />
   <add key="DatabaseId" value="your database id" />
   <add key="CollectionId" value="your collection Name" />
</appSettings>

Step 2: Add one.aspx page.

<div>
   <asp:gridview ID="gv" runat="server"></asp:gridview>
</div>

Step 3: Codebehind page .cs.

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Configuration;
using System.Data.SqlClient;
using System.Data;
using System.IO;
// Add DocumentDB references
using Microsoft.Azure.Documents;
using Microsoft.Azure.Documents.Client;
using Microsoft.Azure.Documents.Linq;
using System.Web.Services;
// Add Newtonsoft.Json references
using Newtonsoft.Json;
public partial class _Default: System.Web.UI.Page
{
    string databaseId = ConfigurationManager.AppSettings["DatabaseId"];
    string collectionId = ConfigurationManager.AppSettings["CollectionId"];
    string endpointUrl = ConfigurationManager.AppSettings["EndPointUrl"];
    string authorizationKey = ConfigurationManager.AppSettings["AuthorizationKey"];
    protected void Page_Load(object sender, EventArgs e)
    {
        GetStartedDemo();
    }
    public class RootObject
    {
        public string ArticleId
        {
            get;
            set;
        }
        public string HeadLine
        {
            get;
            set;
        }
        public string OtherHeadline
        {
            get;
            set;
        }
        public string Abstract
        {
            get;
            set;
        }
        public string AuthorID
        {
            get;
            set;
        }
    }
    public async void GetStartedDemo()
    {
        // Make sure to call client.Dispose() once you've finished all DocumentDB interactions
        // Create a new instance of the DocumentClient
        var client = new DocumentClient(new Uri(endpointUrl), authorizationKey);
        // Check to verify a database with the id=FamilyRegistry does not exist
        // Database database = client.CreateDatabaseQuery().Where(db => db.Id == "Yourdatabaseid").AsEnumerable().FirstOrDefault();
        Database database = client.CreateDatabaseQuery().Where(db = > db.Id == "Yourdatabaseid").AsEnumerable().FirstOrDefault();
        // Check to verify a document collection with the id=FamilyCollection does not exist
        DocumentCollection documentCollection = client.CreateDocumentCollectionQuery(database.CollectionsLink).Where(c = > c.Id == "your collection name").AsEnumerable().FirstOrDefault();
        var families = client.CreateDocumentQuery(documentCollection.DocumentsLink,
            "SELECT * FROM Collectionname");
        string a = t.ArticleId;
        DataTable dt = new DataTable();
        dt.Columns.AddRange(new DataColumn[3]
        {
            new DataColumn("ArticleId", typeof(string)),
            new DataColumn("HeadLine", typeof(string)),
            new DataColumn("Abstract", typeof(string))
        });
        foreach(var family in families)
        {
            string s = Convert.ToString(family);
            var t = JsonConvert.DeserializeObject < RootObject > (s);
            dt.Rows.Add(t.ArticleId, t.HeadLine, t.Abstract);
        }
        gv.DataSource = dt;
        gv.DataBind();
    }
}