help using multiview control

If you hard-coded the textbox in the views then you can just call them by their variable name and set the text value from one to the other.

oTextBox4.Text = oTextBox1.Text;

However, if you are doing this dynamically then you need to use the

FindControl(string controlid)

function.

TextBox
    oTextBox1 = View1.FindControl("oTextBox1") as TextBox
    oTextBox4 = View4.FindControl("oTextBox4") as TextBox;
if((oTextBox1 != null) && (oTextBox4 != null))
    oTextBox4.Text = oTextBox1.Text;