ASP.NET - label is not visible on web page(on server) ?

 string select = "select convert(varchar(35),details)+'...' as 'details1' from test ";
    dt = sh.GetTable(select);
    if (dt.Rows.Count > 0)
    {
      string val = dt.Rows[0]["details"].ToString();
      lbltest.Text = val.Substring(0, 25) + "....";
      or
            lbltest.Text = dt.Rows[0]["details1"].ToString();
    }
Here i cant see any data on server .on local it run perfect.
but,
    lbltest.Text = dt.Rows[0]["details"].ToString();
it show complete data.
I want little data to show.