Change the filter combobox list values based on the value of another filter combobox

Question Comments

An exception of type 'System.ArgumentOutOfRangeException' occurred in mscorlib.dll but was not handled in user code

protected void dgListe_CellEditorInitialize(object sender, ASPxGridViewEditorEventArgs e)
       {
           if (e.Column.FieldName == "ilceid")
           {
               ASPxComboBox cmb = e.Editor as ASPxComboBox;
               cmb.ClientInstanceName = "cmb2";
               cmb.Callback += new DevExpress.Web.CallbackEventHandlerBase(cmb_Callback);

               cmb.DataSourceID = "dsIlce";

           }
           else if (e.Column.FieldName == "sehirid")
           {
               ASPxComboBox cmb = e.Editor as ASPxComboBox;
               cmb.ClientInstanceName = "cmb1";
               cmb.ClientSideEvents.SelectedIndexChanged = "function (s, e) { cmb2.PerformCallback(s.GetValue()); }";
               cmb.ClientSideEvents.Init = "function (s, e) { cmb2.PerformCallback(s.GetValue()); }";
           }
       }

       void cmb_Callback(object sender, DevExpress.Web.CallbackEventArgsBase e)
       {
           ASPxComboBox cmb = sender as ASPxComboBox;

           if (String.IsNullOrEmpty(e.Parameter))
               cmb.Items.Clear();
           else
           {
               dsIlce.SelectParameters[0].DefaultValue = e.Parameter;
               cmb.DataBindItems();
           }
       }