I have created a UserControl1

The control has 3textbox and 4labels
The outline is something like this

    TB1 TB2 TB3
      __________ __________ __________
s.No |__________| ÷ no = |__________| |__________|



The s.No,'÷', 'no' and '=' symbols are 4 labels and 3TextBox as shown
TB2, TB3 tabstop property is set to false, ReadOnly set to true and Modifer property is public


The purpose of this UserControl1 :
value(TB1) ÷ no = TB2
value(TB1) mod no = TB3

This is achieved using the follwing code :

private void textBox1_Leave(object sender, EventArgs e)
{

       if (textBox1.Text != "")
       {
textBox2.Text = (Convert.ToInt32(textBox1.Text) / Convert.ToInt32 (label3.Text) ).ToString();
textBox3.Text = (Convert.ToInt32(textBox1.Text) % Convert.ToInt32(label3.Text) ).ToString();

       }
}


Now I add the above UserControl1 dynamically to my project with
no = 15, Suppose if I add 3 objects of UserControl1 dynamically and enter nos 140, 151, 170 in TB1 I get following result as shown

      __________ __________ __________
   1 |__140_____| ÷ 15 = |___9______| |____5_____|
      __________ __________ __________
   2 |__151_____| ÷ 15 = |___10_____| |____1_____|
      __________ __________ __________
   3 |__170_____| ÷ 15 = |___11_____| |____5_____|
            -------------------------------
                |___30_____| |___11_____|

I want the addition of the Textboxes TB2 and TB3.
How can it be acheived ? I tried what dparsons explained me but it seems that it is not working for a UserControl.
His code given to me is as follow(Works perfectly for simple Textbox
but not for textboxs in UserControl)
foreach(Control ctrl in <parentControl>.Controls)
{
   if(ctrl is TextBox)
   {
      TextBox t = (TextBox)ctrl;
      string s;
      s = t.Text;
   }
}

Help Me..!