Question

I use this method for inserting a textbox in a tablecell

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 = "";

    }

It works correctly.
And this function for saving in db the textbox’s value:

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;
}

But it doesn’t work. beacuse it doesn’t find the textbox created previously.

I’ve put also EnableViewState=”true” in the file aspx.

Why?

Answer 1

You need to create the textbox every time the page is reloaded, this includes the post back.

See the asp.net page lifecycle for more information – you should create your dynamic controls in the Page.Init event, so it will be available later on.