C# Windows Form Application - value not printing in textbox for each time

Question

Value not printing in textbox for each time.. Iam able to see last value only (10) in textbox.

  private void button1_Click(object sender, EventArgs e)
    {
      for(int i = 0; i<=10; i++)
       {
         textBox1.Text = i.ToString();
         Thread.Sleep(100);
       }
    }

Answer 1

In C# Window application, control values are render after event is executed.

After your click event textbox is displaying last value that is updated.

If you want to render text-box value during event execution.You have to call refresh method of text-box to render value.

Use this.. You have to refresh textbox control.

 for (int i = 0; i <= 10; i++)
 {
    textBox1.Text = i.ToString();
    textBox1.Refresh();
    Thread.Sleep(100);
 }

Answer 2

each time your code runs it sets all the text in the textbox to i, you need to use:

textBox1.Text += i.ToString();

instead of

textBox1.Text = i.ToString();