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validating dropdownlist and radiobutton list in javascript

Solution :-


<script type="text/javascript">
            function ValidateCheckBoxPref(sender, args) {
             
                    var list = document.getElementById("<% =rblfoodoptionpreference.ClientID %>"); //Cleint ID             of RadioButtonList
                var rdbtnLstValues = list.getElementsByTagName("input");              
                    var Checkdvalue='notselect';
                    for (var i = 0; i < rdbtnLstValues.length; i++) {
                        if (rdbtnLstValues[i].checked) {
                            Checkdvalue = rdbtnLstValues;
                            break;
                        }
                    }


                    var e = document.getElementById("<% =ddlPreferencesRoom.ClientID %>");
                    var strUser = e.options[e.selectedIndex].value;
                    var strUser1 = e.options[e.selectedIndex].text;

                    if(strUser==0 && Checkdvalue=='notselect')
                    {
                        args.IsValid = false;
                        alert("Please Select at least one option to submit !!");
                    }
                    else
                    {
                        args.IsValid = true;
                    }
                }

    </script>

and use cutom validator for this

<asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="* No option Selected !!" ClientValidationFunction="ValidateCheckBoxPref" ValidationGroup="pref"></asp:CustomValidator>

DONE :)

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