Design Mode Error: 'System.Data.DataRowView' does not have a property with the name 'propertyName'

[Abdallah]

Dear Admin ,
i'm using RadCoboBox with objectDatasource by setting the DataSourceID by the objectdatasource ID , the object datasource returned DataTable .

when her tying to render this control in the design mode it gives that error .

Note:its worked fine in the run mode 

Please Give me you assist
my work in the page too slow 

regards 
Ab Abulubbad

<tel:RadComboBox ID="ddlQuarter" Runat="server" A="" AllowCustomText="false"
                  AppendDataBoundItems="true" AutoPostBack="True"  DataSourceID="odsQuarter" DataTextField="LookupDetalDeepName"
                  DataValueField="LookupDetailsDeep_ID"
                  HighlightTemplatedItems="true" MarkFirstMatch="true" Skin="Web20">
                  <Items>
                      <tel:RadComboBoxItem Text="------Please Choose-----" Value="0" />
                  </Items>
              </tel:RadComboBox>
              <asp:ObjectDataSource ID="odsQuarter" runat="server"
                  SelectMethod="GetLockupDetails"
                  TypeName="GWERP.DataAccess.Lockups.GeneralLookupDeep">
                  <SelectParameters>
                      <asp:ControlParameter ControlID="ddlCity" Name="LockupMaster_ID"
                          PropertyName="SelectedValue" Type="Int32" />
                      <asp:Parameter DefaultValue="ar" Name="Lang" Type="String" />
                  </SelectParameters>
              </asp:ObjectDataSource>

[Simon]

Hi Abdallah,

The design time environment does not reflect all possible fields of the DataRowView object  so it throws this exception. As you have already noted this error exists only in design-time, so it can be considered 'not harmful'.

I hope this helps.

Greetings,
Simon
the Telerik team