textbox dynamically created not found
<p>I use this method for inserting a textbox in a tablecell</p>

<pre><code>protected void EditAttivitaClick(object sender, EventArgs e)
    {
        string attivitaID = ((ImageButton)sender).ID.Split('_')[2];
        tableCell =(HtmlTableCell)FindControl("AttivitaDescrizione_" + attivitaID);                
        TextBox txt = new TextBox();
        txt.Text = tableCell.InnerHtml;
        txt.ID = "TxtAttivitaDescrizione_" + attivitaID;
        tableCell.InnerHtml = "";

    }
</code></pre>

<p>It works correctly. 
And this function for saving in db the textbox's value:</p>

<pre><code>protected void SalvaAttivitaClick(object sender, EventArgs e)
    {
        string attivitaID = ((ImageButton)sender).ID.Split('_')[2];
        TextBox txt = (TextBox)FindControl("TxtAttivitaDescrizione_" + attivitaID);
        string a = txt.Text;        
        attivitaTableAdapter.UpdateID(txt.Text, Int32.Parse(attivitaID));
        tableCell.Controls.Clear();
        tableCell.InnerHtml = a;
}
</code></pre>

<p>But it doesn't work. beacuse it doesn't find the textbox created previously.</p>

<p>I've put also   EnableViewState="true" in the file aspx.</p>

<p>Why?</p>
