C#

while (true)
            {
                //keep checking if timer expired or app closed externally (ie. by user)
                if (dtEndTime <= DateTime.Now || p.HasExited)
                {
                    if (!p.HasExited)
                        p.Kill();
                    break;
                }
                System.Threading.Thread.Sleep(500);
            }

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

namespace T9Sozluk
{
    public partial class frmT9 : Form
    {
        public frmT9()
        {
            InitializeComponent();
        }

        SqlConnection Baglanti = new SqlConnection(Properties.Settings.Default.DBYolu.ToString());
        SqlCommand Komut;
        SqlDataReader dr;
        string text = "", sonuc = "";
        string[] dizi = new string[1];
        int sayi = 0, deger=0, Lstart = 0, Lend = 0;
        Point pnt;
        bool swich = true;
        bool show = true;

        private void Form1_Load(object sender, EventArgs e)
        {
            Baglan(true);
            listBox1.Hide();
        }

        public void Baglan(bool value)
        {
            if (value)
            {
                if (Baglanti.State == ConnectionState.Closed)
                    Baglanti.Open();       
            }
            else if (!value)
            {
                if (Baglanti.State == ConnectionState.Open)
                    Baglanti.Close();       
            }
        }

        private void MakeSelection()
        {
            richTextBox1.SelectionStart = richTextBox1.TextLength;
            richTextBox1.SelectedText = Convert.ToString(listBox1.SelectedItem);
            sonuc = richTextBox1.Text;
            sonuc = sonuc.Remove((Lend - sayi), sayi);
            richTextBox1.Text = sonuc;
            Lstart = richTextBox1.TextLength;
            swich = true;
            listBox1.Hide();
            //richTextBox1.Cursor = 
        }

        private void ShowSelection()
        {
            if (!show)
            {
                
                listBox1.Items.Clear();

                Lend = richTextBox1.TextLength;
                sayi = Lend - Lstart;
                text = richTextBox1.Text;
                if (Lstart > 3)
                    text = text.Remove(0,Lend-sayi);

                text = text.TrimStart(Convert.ToChar(" "));
                sayi = text.Length;
                text = text + "%";

                Komut = new SqlCommand("select count(kelimeadi) from kelimeler where " +
                                           "kelimeadi like @KelimeAdi", Baglanti);
                Komut.Parameters.Add("@KelimeAdi", SqlDbType.NVarChar).Value = text.ToString();


                try
                {
                    dr = Komut.ExecuteReader(CommandBehavior.SingleResult);
                    if (dr.Read())
                        deger = dr.GetInt32(0);
                }
                catch (Exception hata)
                {
                    MessageBox.Show(hata.ToString());
                }
                dr.Close();
                dr.Dispose();

                if (deger>0)
                {
                    Komut = new SqlCommand("Select Kelimeadi From Kelimeler Where" +
                                           " KelimeAdi like @KelimeAdi", Baglanti);
                    Komut.Parameters.Add("@KelimeAdi", SqlDbType.NVarChar).Value = text;
                    dr = Komut.ExecuteReader();

                    if (dr.Read())
                    {
                        for (int i = 0; i < deger; i++)
                        {
                            dizi[0] = dr.GetString(0);
                            listBox1.Items.Add(dizi[0]);
                            dr.Read();
                        }
                    }
                    dr.Close();
                    dr.Dispose();
                }

                if (deger>0)
                {
                    pnt = richTextBox1.GetPositionFromCharIndex(richTextBox1.TextLength);
                    pnt.X = pnt.X + 15;
                    pnt.Y = pnt.Y + 20;
                    listBox1.Location = pnt;
                    listBox1.Show();
                }
            }
        }

        private void Form1_KeyPress(object sender, KeyPressEventArgs e)
        {
            if ((e.KeyChar == 17))
            {
                show = false;
                swich = false;
            }
            else
                show = true;

            if (!swich)
            {
                if (e.KeyChar == 13)
                    MakeSelection();
                else
                    ShowSelection();
            }
        }

        private void tsItemEkle_Click(object sender, EventArgs e)
        {
            Komut = new SqlCommand("Insert into Kelimeler(KelimeAdi) values(@KelimeAdi)", Baglanti);
            Komut.Parameters.Add("@KelimeAdi", SqlDbType.NVarChar).Value = text.Remove(sayi);

            try
            {
                Komut.ExecuteNonQuery();
                MessageBox.Show("Kelime Listeye Eklendi...");
            }
            catch (Exception hata)
            {
                MessageBox.Show(Convert.ToString(hata));
            }
            return;
        }
    }
}