Hi
If you want to clear certain controls value then go for Client Side Scripts.
I have given a dummy scenario which matches your requirements.
<asp:CheckBox ID="CheckBox1" Text="Check Item" Checked="true" runat="server" />
<asp:RadioButton ID="RadioButton1" Text="Radio Item" Checked="true" runat="server" />
<asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine"></asp:TextBox>
<asp:Button ID="Button1" runat="server" Text="Button" OnClientClick="ClearAll()" />
and the script is
<script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script type="text/javascript">
function ClearAll() {
$('#<%= TextBox1.ClientID %>').val("");
$('#<%=CheckBox1.ClientID %>').prop("checked", false);
$('#<%=RadioButton1.ClientID %>').prop("checked", false);
}
</script>