C#

REngine.SetDllDirectory(dlldir);
      REngine.CreateInstance("RDotNet");
REngine engine = REngine.GetInstanceFromID("RDotNet");
engine.EagerEvaluate("dataset<-read.table(file.choose(), header=TRUE, sep = ',')");
DataFrame dataset = engine.EagerEvaluate("dataset").AsDataFrame();

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using Microsoft.Win32;
using RDotNet;
using RDotNet.NativeLibrary;
using Microsoft.Win32;

namespace RScript
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            string dlldir = @"C:\Program Files\R\R-3.3.0\bin\x64";
            bool r_located = false;
            Environment.SetEnvironmentVariable("PATH", Environment.GetEnvironmentVariable("PATH") + ";" + dlldir);
            InitializeComponent();    

            while (r_located == false)
            {
                try
                {
                    REngine.SetDllDirectory(dlldir);
                    REngine.CreateInstance("RDotNet");
                    r_located = true;
                }

                catch
                {
                    MessageBox.Show(@"Unable to find R installation's \bin\i386 folder.
                    Press OK to attempt to locate it.");

                    /if (folderBrowserDialog1.ShowDialog() == DialogResult.OK)
                    {
                        dlldir = @folderBrowserDialog1.SelectedPath;
                    }/

                }
            }

        }

        private void button1_Click(object sender, EventArgs e)
        {
            REngine engine = REngine.GetInstanceFromID("RDotNet");

            try
            {
                // import csv file
                engine.EagerEvaluate("dataset<-read.table(file.choose(), header=TRUE, sep = ',')");

                // retrieve the data frame
                DataFrame dataset = engine.EagerEvaluate("dataset").AsDataFrame();

                for (int i = 0; i < dataset.ColumnCount; ++i)
                {
                    dataGridView1.ColumnCount++;
                    dataGridView1.Columns[i].Name = dataset.ColumnNames[i];
                }

                for (int i = 0; i < dataset.RowCount; ++i)
                {
                    dataGridView1.RowCount++;
                    dataGridView1.Rows[i].HeaderCell.Value = dataset.RowNames[i];

                    for (int k = 0; k < dataset.ColumnCount; ++k)
                    {
                        dataGridView1[k, i].Value = dataset[i,k];

                    }

                }

            }

            catch
            {
                MessageBox.Show(@"Equation error.");
            }
        }

    }
}

using System;
using System.Drawing;
using System.Windows.Forms;

namespace Scr.Tests
{
    class Program
    {
        static void Main(string[] args)
        {
            Rectangle desktop = SystemInformation.VirtualScreen;
            Console.WriteLine(desktop.ToString());

            Screen[] screens = Screen.AllScreens;
            for (int i = 0; i < screens.Length; i++)
            {
                Console.WriteLine(screens[i].Bounds.ToString()); // Total.
                Console.WriteLine(screens[i].DeviceName);
                Console.WriteLine(screens[i].WorkingArea.ToString()); // Total minus system usage i.e. taskbar.
            }
        }
    }
}

I need to access my gmail contacts to upgrade an Access database. A program in C # manages this basis. I checked on the Internet and appeared several ways, but none worked. I found a video that the speaker creates the code step by step and in the end he managed to access the gmail contacts.
I typed the code and is giving an error in word in of code:
foreach (Contact contato in f.Entries)

The following code:

using System;
using System.Data;
using Google.Contacts;
using Google.GData.Client;
using Google.GData.Extensions;

namespace ContatosGmail
{
    public partial class Default : System.Web.UI.Page
    {

        protected void btnObter_Click(object sender, EventArgs e)
        {
            DataSet ds = new DataSet();
            ds.Tables.Add("GmailContacts");
            ds.Tables[0].Columns.Add("EmailId");
            RequestSettings rs = new RequestSettings("Taveira", txtUsername.Text, txtPassword.Text);
            rs.AutoPaging = true;
            ContactsRequest cr = new ContactsRequest(rs);
            Feed<Contact> f = cr.GetContacts();
            
            foreach (Contact contato in f.Entries)
            {
                foreach (EMail email in contato.Emails)
                {
                    DataRow row = ds.Tables[0].NewRow();
                    row["EmailId"] = email.Address.ToString();
                    ds.Tables[0].Rows.Add(row);
                }
            }
            GridView1.DataSource = ds.Tables[0];
            GridView1.DataBind();
            lblStatus.Text = "Toal de contatos para " + txtUsername.Text + ": " + ds.Tables[0].Rows.Count.ToString();
        }
    }
}

I am in urgent need of this solution.
Using Visual Studio Professional 15 and Windows 10.
Thank you.