problem in progressbar i can not solve it

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C#

WinForms

programming

I have a problem in updating the progressbar and textbox at c#.

when i tried this code

using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;
namespace WindowsFormsApplication2
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            textBox1.Text = "1";
            for (int i = 1; i < 11; i++)
            {
                textBox1.Text = (int.Parse(textBox1.Text) + 1).ToString();
                textBox1.Refresh();
                progressBar1.Value += 10;
                progressBar1.Refresh();
                Thread.Sleep(2000);
            }
        }
    }
}

the updating of textbox and progress bar work fine and the text appear on the textbox periodically very well.

i made a program that has server and client to send a file from client to server

i did it and it work very well and i tried it on a file with size 200 Mb

when i tried to make a progressbar and apdate it during the sending and receiving operation it disnot work, it still not progress untill the end of the program go to 100 % suddenly i tried to out the value to a textbox but the text of it not appear untill the end of the program

when i tried to debug i found that the text of the textbox and the progressbar value was updating as i want but why they had no effect untill the end of the program? it is my question

the piece of code that i used the progress bar in is there

//it is a part of the sender of the file
 int i = 1;
 int value = 0;
remainsize = totalsize;//totalsize is the size of the file
while (remainsize > 1024)
{
 data = new byte[1024];
 myfile.Read(data, 0, 1024);//read 1K from the file
 myclient.Client.Send(data);//send the data to the receiver
 data = new byte[2];
 myclient.Client.Receive(data);//wait for OK from the receiver
 if (Encoding.ASCII.GetString(data) != "OK")
 {
      MessageBox.Show("SOMETHING WRONG!!");
       myclient.Close();
       this.Close();
      Application.Exit();
 }
  remainsize -= 1024;
  value+=5;/*increment value here with 5 to test i will update it in my code after solving it*/
  textBox3.Text = value.ToString();//update the textbox
  textBox3.Refresh();//refresh it to appear the text ///do not appear any thing
  progressbar1.value=value;//update the value of the progressbar
  progressbar1.Refresh();
  System.Threading.Thread.Sleep(2000);/* thought the problem in timing and i used this but with no use*/

if you want me to upload all the project tell me and i will do this