Mutually Exclusive Check Box Extender In ASP.NET

<div>

<asp:ScriptManager ID="ScriptManager1" runat="server">

</asp:ScriptManager>

<asp:Panel ID="Panel1" runat="server" BackColor="LightSeaGreen">

<div><center>Choices...</center></div>

<asp:Label ID="label1" runat="server" Text="Movies" Font-Bold="true"/><br />

<br />

<asp:CheckBox ID ="CheckBox1" runat="server" Text="Hollywood" /><br />

<asp:CheckBox ID ="CheckBox2" runat="server" Text="bollywood" />

<br />

<br />

<asp:Label ID="label2" runat="server" Text="Food" Font-Bold="true" />

<br />

<br />

<asp:CheckBox ID ="CheckBox3" runat="server" Text="Indian" />

<br />

<asp:CheckBox ID ="CheckBox4" runat="server" Text="South-Indian" />

</asp:Panel>

<c1:DropShadowExtender ID="DropShadowExtender1" runat="server" Opacity="0.1" Radius="10" Rounded="true" TargetControlID="Panel1" TrackPosition="true" Width="15">

</c1:DropShadowExtender>

<c1:MutuallyExclusiveCheckBoxExtender ID="MutuallyExclusiveCheckBoxExtender1" runat="server" TargetControlID="CheckBox1" Key="Movie">

</c1:MutuallyExclusiveCheckBoxExtender>

<c1:MutuallyExclusiveCheckBoxExtender ID="MutuallyExclusiveCheckBoxExtender2" runat="server" TargetControlID="CheckBox2" Key="Movie">

</c1:MutuallyExclusiveCheckBoxExtender>

<c1:MutuallyExclusiveCheckBoxExtender ID="MutuallyExclusiveCheckBoxExtender3" runat="server" TargetControlID="CheckBox3" Key="Food">

</c1:MutuallyExclusiveCheckBoxExtender>

<c1:MutuallyExclusiveCheckBoxExtender ID="MutuallyExclusiveCheckBoxExtender4" runat="server" TargetControlID="CheckBox4" Key="Food">

</c1:MutuallyExclusiveCheckBoxExtender>

</div>