Need Help....I cannot find the value into the listbox when I enter manually...

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C#

C#4.0

Hello guys,

I got some values from a text file to the listbox. And then I select a value in the listbox and send it to textbox. When I search this value into the listbox then it's been found. There is no any problem until here.. The problem is when I enter the value into the textbox manually then cannot be found into the listbox.

First, I select it by mouse and then it's been found.
However, when I type it into the textbox manually then it's been not found.

How can I solve this problem?

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.Collections;
using System.IO;

namespace WindowsFormsApplication16
{
    public partial class Form1 : Form
    {
        DataClasses1DataContext data;
        public Form1()
        {
            InitializeComponent();
            data = new DataClasses1DataContext();
        }
      
            ArrayList manular = new ArrayList();
       
        private void button1_Click(object sender, EventArgs e)
        {
            
            foreach (var st in data.DEPO_REFARANs.ToList())
            {
                manular.Add(st.BD_NO);
              
                
               
            }
           FileStream _oku=new FileStream(@"C:\Excel\P0186733.txt",FileMode.Open,FileAccess.Read);
              
            StreamReader oku = new StreamReader(_oku);
            FileStream _oku1 = new FileStream(@"C:\Excel\Veri.txt", FileMode.Open, FileAccess.Read);
            StreamReader oku1=new StreamReader(_oku1);

            string[] veriler = oku1.ReadToEnd().ToString().Split(',');
            
            for (int i = 0; i < veriler.Length; i++)
            {
                listBox2.Items.Add(veriler[i].ToString());
            }
            string[] _veri = oku.ReadToEnd().ToString().Split(' ');
            ArrayList veri = new ArrayList();
            for (int i = 0; i < _veri.Length; i++)
            {
                string deger = _veri[i].ToString();
                if (deger!="")
                {
                    veri.Add(deger);
                    listBox1.Items.Add(deger);
                }
            }
            for (int i = 0; i < veri.Count; i++)
            {
                string deger = veri[i].ToString();
                for (int k = 0; k < manular.Count; k++)
                {
                    string manu = manular[k].ToString();
                    
                    if (string.Compare(deger,manu)==0)
                    {
                        listBox1.Items.Add(_veri.ToString().Trim());
                    }
                }
            }
            oku.Close();
            oku1.Close();
            _oku.Close();
            _oku1.Close();

        }

        private void button2_Click(object sender, EventArgs e)
        {

            
        }

        private void listBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            textBox1.Text = listBox1.SelectedItem.ToString();
            MessageBox.Show(listBox1.SelectedItem.ToString());
        }
    }
}

Regards

Haluk