C#

private void barButtonItemStartRec_ItemClick(object sender, ItemClickEventArgs e)
        {
            barButtonItemStartRec.Enabled = !(barButtonItemStopRec.Enabled = true);            

            var dlg = new MainForm();
            BackgroundWorker recWorker = new BackgroundWorker();
            recWorker.DoWork += dlg.StartRec;
            recWorker.RunWorkerAsync();          
        }
        
private void barButtonItemStopRec_ItemClick(object sender, ItemClickEventArgs e)
        {            
            barButtonItemStartRec.Enabled = !(barButtonItemStopRec.Enabled = false);
            var dlg = new MainForm();
            dlg.StopRec();            
        }

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Net;
using System.Net.Mail;

namespace emailC
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                using (MailMessage mail = new MailMessage())
                {
                    using (SmtpClient smtp = new SmtpClient("smtp.mail.yahoo.com", 587))
                    {
                        mail.From = new MailAddress("fgelana@yahoo.com");
                        mail.To.Add("fraolgela@gmail.com");
                        mail.Subject = "C# Email";
                        mail.Body = "This is for testing SMTP mail for yahoo using C#";
                        smtp.Credentials = new System.Net.NetworkCredential("name@yahoo.com", "password");
                        smtp.EnableSsl = false;
                        smtp.Send(mail);
                    }
                }
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }
    }
}

   PdfDocument outputDocument = new PdfDocument();
        PdfPage editablePage = outputDocument.AddPage();
        editablePage.Size = PageSize.A4;
        XGraphics gfx = XGraphics.FromPdfPage(editablePage);

       MigraDoc.DocumentObjectModel.Document doc3 = new          MigraDoc.DocumentObjectModel.Document();
        MigraDoc.DocumentObjectModel.Tables.Table table3 = new MigraDoc.DocumentObjectModel.Tables.Table();

            Column column3 = table3.AddColumn(70);
            column3.Format.Alignment = ParagraphAlignment.Left;
            column3.Format.Font.Bold = false;

            column3 = table3.AddColumn(50);
            column3.Format.Alignment = ParagraphAlignment.Center;
            column3.Format.Font.Bold = false;

            Row row3 = table3.AddRow();
            row3.Format.Alignment = ParagraphAlignment.Center;
            row3.Format.Font.Bold = true;
            row3.Format.Font.Size = 9;

            row3[0].AddParagraph("Serial");
            row3[1].AddParagraph("Time");
...............................................................

...............................................................
while (reader1.Read())
{
 row3 = table3.AddRow();
 row3[0].AddParagraph(Convert.ToString(reader1.GetValue(0)));
row3[1].AddParagraph(Convert.ToString(reader1.GetValue(1)));
}
...............................................................

...............................................................
table3.Rows[0].KeepWith = table3.Rows.Count-1;
doc3.AddSection().Add(table3);
       
DocumentRenderer docRenderer3 = new DocumentRenderer(doc3);
docRenderer3.PrepareDocument();
docRenderer3.RenderObject(gfx, 50, 0, 0, table3);

private static void SendCompletedCallback(object sender, AsyncCompletedEventArgs e)
{
    // Get the unique identifier for this asynchronous operation.
    String token = (string)e.UserState;

    if (e.Cancelled)
    {
        Console.WriteLine("[{0}] Send canceled.", token);
    }
    if (e.Error != null)
    {
        MessageBox.Show(String.Format("[{0}] {1}", token, e.Error.ToString()));
    }
    else
    {
        Console.WriteLine("Message sent.");
    }

    mailSent = true;
}
        
private static void send_message()
{
    // Command line argument must the the SMTP host.
    SmtpClient client = new SmtpClient("smtp.gmail.com");
    client.Port = 587;
    client.Credentials = new System.Net.NetworkCredential("it@mydomain.com", "my_password");
    client.EnableSsl = true;

    // Specify the e-mail sender. 
    // Create a mailing address that includes a UTF8 character 
    // in the display name.
    MailAddress from = new MailAddress("it@mydomain.com", "My" + (char)0xD8 + " Company", System.Text.Encoding.UTF8);
    // Set destinations for the e-mail message.
    MailAddress to = new MailAddress("jassim@mydomain.com");
    // Specify the message content.
    MailMessage message = new MailMessage(from, to);
    message.Body = "This is a test e-mail message sent by an application. ";
    // Include some non-ASCII characters in body and subject. 
    string someArrows = new string(new char[] { '\u2190', '\u2191', '\u2192', '\u2193' });
    message.Body += Environment.NewLine + someArrows;
    message.BodyEncoding = System.Text.Encoding.UTF8;
    message.Subject = "test message 1" + someArrows;
    message.SubjectEncoding = System.Text.Encoding.UTF8;
    // Set the method that is called back when the send operation ends.
    client.SendCompleted += new SendCompletedEventHandler(SendCompletedCallback);
    // The userState can be any object that allows your callback  
    // method to identify this send operation. 
    // For this example, the userToken is a string constant. 
    string userState = "test message1";
    client.SendAsync(message, userState);
    Console.WriteLine("Sending message... press c to cancel mail. Press any other key to exit.");
    string answer = Console.ReadLine();
    // If the user canceled the send, and mail hasn't been sent yet, 
    // then cancel the pending operation.

    // if (answer.StartsWith("c") && mailSent == false)
    // {
        // client.SendAsyncCancel();
    // }

    // Clean up.
    message.Dispose();
    Console.WriteLine("Goodbye.");
}

private void btnSend_Click(object sender, EventArgs e)
{
    // XtraMessageBox.Show("You are about to send this message to all contacts!", "Send", MessageBoxButtons.OK, MessageBoxIcon.Warning);

    if (XtraMessageBox.Show("Are you sure you want to send this message to all contacts now?", "Send", MessageBoxButtons.YesNo, MessageBoxIcon.Question) == System.Windows.Forms.DialogResult.Yes)
    {
        send_message();
    }
}