I have a WebDropDown "DDthisWeek" representing the week number of a year in my page and filled not from a datasource but only by Items 1 to 52.
While loading the page in the preload event I set one item to be the selected item e.g. that item that the actual week represents. That works so far.But now if the user selects an other item  in that DropDown the DDthisWeek_SelectionChanged is fired. Now in the code of this event handler I want to find out, which new value is selected and so I tried this:

Dim var = DDthisWeek.selectedValue

Unfortunately this does not give me the not the newly selected value but the old. Why? Is that correct and I'm not understanding this correctly?
To get the selected value I have to do the following:
1. Get the active Item index :

 val idx = me.DDthisWeek.ActiveItemIndex

2. now using this to set the selection:

Me.DDthisWeek.Items(idx).Selected = True

3.no this has the expected value:

  var = DDthisWeek.selectedValue

But this works only the first time! If I now select another Item, I get the correct ActiveItemIndex but line 3 gives me still the old value.
How can I get the correct value after the user has selected an item. 

my DropDowns code ist

            <ig:WebDropDown ID="DDthisWeek" runat="server" Width="50px" AutoPostBack="False" AutoPostBackFlags-SelectionChanged="On">
               <AutoPostBackFlags SelectionChanged="On" />                                                                           
               <Items>                                                                                                               
                  <ig:DropDownItem Key="01" Selected="False" Text="01" Value="01">                                                   
                  </ig:DropDownItem>                                                                                                 
                  <ig:DropDownItem Key="02" Selected="False" Text="02" Value="02">                                                   
                  </ig:DropDownItem>                                                                                                 
                  <ig:DropDownItem Key="03" Selected="False" Text="03" Value="03">                                                   
                  </ig:DropDownItem>                                                                                                 
                                    .....
                  <ig:DropDownItem Key="50" Selected="False" Text="50" Value="50">                                                   
                  </ig:DropDownItem>                                                                                                 
                  <ig:DropDownItem Key="51" Selected="False" Text="51" Value="51">                                                   
                  </ig:DropDownItem>                                                                                                 
                  <ig:DropDownItem Key="52" Selected="False" Text="52" Value="52">                                                   
                  </ig:DropDownItem>                                                                                                 
               </Items>                                                                                                              
            </ig:WebDropDown>