DataBind() does not allow ListItem.Selected property to be set

Question

when databinding a listbox to a dataset and using the ListItem.Selected property also the SelectedIndex property are never set when user selects the perticular item. so the if(item.selected) is never set true . is there any problem with the databinding because when not using databinding and just using ListBox.add() method it works properly this is the code in page_load:- listbox_project_users.SelectionMode=ListSelectionMode.Multiple; listbox_all_users.SelectionMode=ListSelectionMode.Multiple; conn = new SqlConnection(); conn.ConnectionString = configurationSettings.AppSettings.Get("BepDB"); conn.Open(); cmd=new SqlCommand("SELECT PrjUser.UserID AS UserID,Users.UserName AS Name FROM PrjUser INNER JOIN Users ON PrjUser.UserID=Users.UserID WHERE PrjID=1; SELECT UserID,UserName FROM Users WHERE UserID NOT IN (SELECT UserID FROM PrjUser WHERE PrjID=1);",conn); da=new SqlDataAdapter(cmd); ds=new DataSet("PrjUsers"); da.Fill(ds); listbox_project_users.DataTextField="Name"; listbox_project_users.DataValueField="UserID"; listbox_project_users.DataSource=ds.Tables[0]; listbox_project_users.DataBind(); listbox_all_users.DataTextField="UserName"; listbox_all_users.DataValueField="UserID"; listbox_all_users.DataSource=ds.Tables[1]; listbox_all_users.DataBind(); when user clicks the add button on the page i am supposed to update the database depending on the selected item but the if statement never clears.(always false) the button_click method:- foreach (ListItem item in listbox_all_users.Items) { if(item.Selected) { cmd=new SqlCommand("INSERT INTO PrjUser VALUES (1,5,1,0)",conn); cmd.ExecuteNonQuery(); } } pls give it a thought