Validate TextBox based on ASP.Net DropDownList selected value using jQuery

Hi ramco1917,

Please refer below Code.

HTML

Status:
<asp:DropDownList ID="ddlStatus" class="form-control" runat="server" required="true">
    <asp:ListItem Value="">Select Status</asp:ListItem>
    <asp:ListItem Value="Return Dispatched">Return Dispatched</asp:ListItem>
    <asp:ListItem Value="Return Delivered">Return Delivered</asp:ListItem>
</asp:DropDownList>
<br />
Date of Delivery:
<asp:TextBox ID="txtDelivery" runat="server"></asp:TextBox>
<br />
<asp:Label ID="lblMessage" runat="server" Style="display: none; color: Red;" Text="Please input delivery date." />
<br />
<asp:Button ID="btnSubmit" runat="server" Text="Submit" />
<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript">
    $(function () {
        $('[id*=btnSubmit]').bind('click', function () {
            $('[id*=lblMessage]').hide();
            var status = $('[id*=ddlStatus]').find('option:selected').val();
            if (status == "Return Delivered") {
                if ($('[id*=txtDelivery]').val() == "") {
                    $('[id*=lblMessage]').show();
                }
            }
            return false;
        });
    });
</script>

Screenshot