Validate Listbox Ckeckbox Abd Radio Buttons

<asp:ListBox ID="ListBox1" runat="server" Rows="6" SelectionMode="Multiple">

            <asp:listitem text="India" value="1"></asp:listitem>

            <asp:listitem text="US" value="2"></asp:listitem>

            <asp:listitem text="UK" value="3"></asp:listitem>

            <asp:listitem text="China" value="4"></asp:listitem>

            <asp:listitem text="Russia" value="5"></asp:listitem>

            <asp:listitem text="New Zealand" value="6"></asp:listitem>

        </asp:ListBox>

        <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Required two country" ClientValidationFunction="Validate_ListBox"></asp:CustomValidator>

        <asp:Button ID="btnSubmit" runat="server" Text="Submit" /><asp:ListBox ID="ListBox1" runat="server" Rows="6" SelectionMode="Multiple">

            <asp:listitem text="India" value="1"></asp:listitem>

            <asp:listitem text="US" value="2"></asp:listitem>

            <asp:listitem text="UK" value="3"></asp:listitem>

            <asp:listitem text="China" value="4"></asp:listitem>

            <asp:listitem text="Russia" value="5"></asp:listitem>

            <asp:listitem text="New Zealand" value="6"></asp:listitem>

        </asp:ListBox>

        <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Required two country" ClientValidationFunction="Validate_ListBox"></asp:CustomValidator>

        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />

        <script>

            function Validate_ListBox(sender, args) {

                var Listoptions = document.getElementById("<%=ListBox1.ClientID%>").options;

                var Selectedcount = 0;

                for (var i = 0; i < Listoptions.length; i++) {

                    if (Listoptions[i].selected == true) {

                        Selectedcount++;

                    }

                }

                if (Selectedcount <= 2) {

                    args.IsValid = false;

                } else {

                    args.IsValid = true;

                }

            }

        </script>

        /////////////////////////////////////////////

        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

        <script>

            function CheckBoxList1_Validation(sender, args) {

                args.IsValid = false;

                var cnt = $("#CheckBoxList1 input:checked").length;

                args.IsValid = (cnt >= 2);

            }

        </script>

        Select at least 2 countries:

        <asp:CheckBoxList ID="CheckBoxList1" runat="server">

            <asp:listitem text="India" value="1"></asp:listitem>

            <asp:listitem text="US" value="2"></asp:listitem>

            <asp:listitem text="UK" value="3"></asp:listitem>

            <asp:listitem text="China" value="4"></asp:listitem>

            <asp:listitem text="Russia" value="5"></asp:listitem>

            <asp:listitem text="New Zealand" value="6"></asp:listitem>

        </asp:CheckBoxList>

        <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Please select at least 2 countries" ClientValidationFunction="CheckBoxList1_Validation" ForeColor="Red"></asp:CustomValidator>

        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />

        ///////////////////////////////////////////////////////

        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

        <script>

            function RadioButtonList1_Validate(sender, args) {

                args.IsValid = ($("#RadioButtonList1 :radio:checked").length > 0);

            }

        </script>

        <asp:RadioButtonList ID="RadioButtonList1" runat="server">

           <asp:listitem text="India" value="1"></asp:listitem>

            <asp:listitem text="US" value="2"></asp:listitem>

            <asp:listitem text="UK" value="3"></asp:listitem>

            <asp:listitem text="China" value="4"></asp:listitem>

            <asp:listitem text="Russia" value="5"></asp:listitem>

            <asp:listitem text="New Zealand" value="6"></asp:listitem>

        </asp:RadioButtonList>

        <asp:CustomValidator ID="CustomValidator1" runat="server" ErrorMessage="Please select a country" Display="Dynamic" ClientValidationFunction="RadioButtonList1_Validate" ForeColor="Red"></asp:CustomValidator>

        <br />

        <asp:Button ID="btnSubmit" runat="server" Text="Submit" />

Enable And Disable

        <script src="//ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>

        <script>

            $(document).ready(function () {

                //Listen for a key up event on the search input

                $('#txt_search').keyup(function () {

                    //When a user presses and releases a key

                    //Check to see if the length of the inputted

                    //data is greater than 2

                    if ($(this).val().length > 2) {

                        //If the input length is greater than

                        //two then we enable the search button

                        $('#btn_search').prop("disabled", false);

                    } else {

                        //If the input length is equal to 2 or less we disable the search button

                        $('#btn_search').prop("disabled", true);

                    }

                });

            });

        </script>

      

        <asp:TextBox ID="txt_search" runat="server"></asp:TextBox>

        <asp:Button ID="btn_search" runat="server" Text="Search" disabled />

        <asp:TextBox ID="txt_search" runat="server"></asp:TextBox>

        <asp:Button ID="btn_search" runat="server" Text="Search" disabled />

jquery datepicker calendar

<html xmlns="http://www.w3.org/1999/xhtml">

    <head runat="server">

        <script src="//ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>

        <link rel="stylesheet" href="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.2/themes/smoothness/jquery-ui.css" />

        <script src="//ajax.googleapis.com/ajax/libs/jqueryui/1.11.2/jquery-ui.min.js"></script>

        <script>

        $(document).ready(function () {

            $("#txt_date").datepicker();

        });

        </script>

    </head>

    <body>

        <form id="form1" runat="server">

            <div>

                <h3>Click to select a date :</h3>

                <asp:textbox ID="txt_date" runat="server"></asp:textbox>

            </div>

        </form>

    </body>

    </html>