TextBox RadioButtonList and DropDownList validation using jQuery in ASP.Net

<script type="text/javascript" src="http://ajax.googleapis.com/ajax/libs/jquery/1.9.1/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $("#btnsave").click(function () {
            if ($("#txtzonal").val() == "" || $("#txtname").val() == "" || $("#txtusername").val() == "" || $("#txtpassword").val() == "" || $("#txtphoneno").val() == "" || $("#txtgmail").val() == "") {
                alert("Textbox is Empty")
            }
            else if ($("[id*=ddlexperience]").val() == "") {
                alert("Dropdownlist is Empty")
            }
            else {
                var radio = $("#ddlgender").find("input");
                var isChecked = false;
                for (var i = 0; i < radio.length; i++) {
                    if (radio[i].checked) {
                        isChecked = true;
                        break;
                    }
                }
                if (!isChecked) {
                    alert("Please select an option from gender!");
                }
            }
            return false;
        });
    });
</script>
Zonal
<asp:TextBox ID="txtzonal" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
Name
<asp:TextBox ID="txtname" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
User Name
<asp:TextBox ID="txtusername" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
Password
<asp:TextBox ID="txtpassword" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
Gender
<asp:RadioButtonList ID="ddlgender" runat="server" RepeatDirection="Horizontal">
    <asp:ListItem>Male</asp:ListItem>
    <asp:ListItem>Female</asp:ListItem>
</asp:RadioButtonList>
<br />
Email
<asp:TextBox ID="txtgmail" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
Phone No
<asp:TextBox ID="txtphoneno" runat="server" AutoCompleteType="Disabled"></asp:TextBox>
<br />
Experience
<asp:DropDownList ID="ddlexperience" runat="server">
    <asp:ListItem Text="Select Experience" Value="" Selected="True"></asp:ListItem>
    <asp:ListItem Text="3 Years" Value="3 Years"></asp:ListItem>
    <asp:ListItem Text="More Than 3 Years" Value="More Than 3 Years"></asp:ListItem>
</asp:DropDownList>
<br />
<asp:Button ID="btnsave" runat="server" Text="Save" />