c# - asp.net radiobuttonlist will not selectindex -


i have radio button list...

            <asp:radiobuttonlist id="rblcollectoptions" runat="server" cssclass="radiolist">             <asp:listitem value="collect" text="collect address"></asp:listitem>             <asp:listitem value="dropoff" text="drop off @ depot (uk only)"></asp:listitem>         </asp:radiobuttonlist>

i have link button on page "enter address manually" want set radio button "collect" value.

i tried...

rblcollectoptions.selectedindex = 0;

and 

rblcollectoptions.items[0].selected = true;

both work if no option selected, if manually set radio button option, or set default selection, link button not work.

call clearselection or set selectedindex = -1 before set selected item.

rblcollectoptions.clearselection();

or 

rblcollectoptions.selectedindex = -1;

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