Autometically remove default text from textbox

Suppose that your dynamic textbox is called txtDynamic.

When you create it, you need to add an extra line to 'wire up' the Enter event:

   txtDynamic.Enter += txtDynamic_Enter;

You now need to add the handler manually rather than via the VS designer as you would with 'static' textboxes:

private void txtDynamic_Enter(object sender, EventArgs e)
{
      TextBox tb = (TextBox)sender;
      tb.Text = "";
}

Note that you can use the same event handler for any number of dynamic textboxes. The 'sender' parameter knows which one is being entered.