Select (Check) Radio Buttons based on DropDownList Selection using JavaScript

HTML:

<form id="form1" runat="server">
    <div>
        <select id="ddlTest">
            <option value="1">Value 1</option>
            <option value="2">Value 2</option>
            <option value="3">Value 3</option>
        </select>
        <input type="radio" name="test" id="tst1" value="1" />
        <input type="radio" name="test" id="tst2" value="2" />
        <input type="radio" name="test" id="tst3" value="3" />
    </div>
    <asp:Button ID="Button1" Text="Click Me!!" runat="server" OnClientClick="ToggleCheckbox();return false;" />
    </form>
    <script type="text/javascript">
        function ToggleCheckbox() {
            var id = parseInt(document.getElementById("ddlTest").value);
            alert(id);
          
            switch (id) {
                case 1:
                    document.getElementById("tst1").checked = true;
                    break;
                case 2:
                    document.getElementById("tst2").checked = true;
                    break;
                case 3:
                    document.getElementById("tst3").checked = true;

            }
        }</script>

please refer this one i have added return false; in onClientClick event and convert the string using parseInt function