Ho risolto riscrivendo il codice in questo modo e non mi da più quell'errore,
Avete idee come mai?:
ecco il codice:
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Data.Odbc;
public partial class Photo_List : System.Web.UI.Page
{
String connectionString = ConfigurationManager.ConnectionStrings["ConnStr"].ConnectionString;
protected void Page_Load(object sender, EventArgs e)
{
try
{
Popola();
}
catch (Exception ex)
{
Response.Write("" + ex.ToString() + "");
}
}
public void Popola()
{
OdbcConnection conn = new OdbcConnection(connectionString);
string SQL = "SELECT * FROM photo where _category=?";
conn.Open();
OdbcCommand cmd = new OdbcCommand(SQL, conn);
cmd.Parameters.AddWithValue("?", "" + Request.QueryString["PhotoCat"] + "");
DataSet ds = new DataSet();
OdbcDataAdapter da = new OdbcDataAdapter(cmd);
da.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
da.Dispose();
ds.Dispose();
cmd.Dispose();
conn.Dispose();
conn.Close();
}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
Popola();
}
protected void DropDownList1_Init(object sender, EventArgs e)
{
OdbcConnection conn = new OdbcConnection(connectionString);
string SQL = "SELECT * FROM photo_category";
OdbcCommand objCommand = new OdbcCommand(SQL, conn);
conn.Open();
OdbcDataReader rdr = objCommand.ExecuteReader();
while (rdr.Read())
{
ListItem li = new ListItem();
li.Text = "" + rdr["cName"].ToString() + "";
li.Value = "" + rdr["iCatId"].ToString() + "";
DropDownList1.Items.Add(li);
}
ListItem list = new ListItem();
list.Text = "Seleziona";
list.Value = "0";
DropDownList1.Items.Insert(0, list);
rdr.Dispose();
rdr.Close();
objCommand.Dispose();
conn.Close();
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Redirect("list.aspx?PhotoCat=" + DropDownList1.SelectedItem.Text + "");
}
}