Hi mfatih,

You can't drag select options from select dropdownlist.

To drag drop you need select option from dropdownlist and drag the p element to the input textbox.

It's not exactly what you wanted, but it will definitely be close to your requirement.

Check this example. Now please take its reference and correct your code.

HTML

<script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>
<script type="text/javascript" src="https://code.jquery.com/ui/1.8.24/jquery-ui.min.js"></script>
<link type="text/css" rel="stylesheet" href="https://code.jquery.com/ui/1.8.24/themes/blitzer/jquery-ui.css" />
<script type="text/javascript">
    $(function () {
        $(".draggable").draggable({
            revert: true,
            helper: 'clone',
            start: function (event, ui) {
                $(this).fadeTo('fast', 0.5);
            },
            stop: function (event, ui) {
                DeleteValues()
                $(this).fadeTo(0, 1);
            }
        });

        $("table input").droppable({
            drop: function (event, ui) {
                this.value = $(ui.draggable).find('select option:selected').text();
            }
        });
    });
    function DeleteValues() {
        var dropDown = document.getElementById("ddlVehicles");
        for (var i = 0; i <= dropDown.options.length; i++) {
            if (dropDown.options[i].selected) {
                dropDown.removeChild(dropDown.options[i]);
                break;
            }
        }
    }
</script>
<p align="center" class="draggable" style="border: 1px solid red; width: 100px;">
    <select id="ddlVehicles" name="ogrenciler" style="font-family: Tahoma; font-size: 8pt">
        <option value="BMV">BMV</option>
        <option value="Mercedes">Mercedes</option>
        <option value="Fiat">Fiat</option>
        <option value="Volvo">Volvo</option>
        <option value="Nissan">Nissan</option>
        <option value="Audio">Audio</option>
        <option value="Ford">Ford</option>
        <option value="Lada">Lada</option>
    </select>
</p>
<p>
    &nbsp;</p>
<div align="center">
    <table border="1">
        <tr>
            <td align="center">
                <b><font face="Tahoma" size="1">Order </font></b>
            </td>
            <td align="center" colspan="2">
                <b><font face="Tahoma" size="1">GARAGE1</font></b>
            </td>
            <td align="center" colspan="2">
                <b><font face="Tahoma" size="1">GARAGE2</font></b>
            </td>
            <td align="center" colspan="2">
                <b><font face="Tahoma" size="1">GARAGE3</font></b>
            </td>
            <td align="center" colspan="2">
                <b><font face="Tahoma" size="1">GARAGE4</font></b>
            </td>
        </tr>
        <tr>
            <td align="center">
                <b><font face="Tahoma" size="1">1</font></b>
            </td>
            <td style="float: right" align="center">
                <font size="1" face="Tahoma">
                    <input name="kapi1" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="kapi11" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="ortak1" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="ortak11" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="ortap1" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="ortap11" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="pencere1" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
            <td align="center">
                <font size="1" face="Tahoma">
                    <input name="pencere11" size="17" style="border: 1px solid #FFFFFF" /></font>
            </td>
        </tr>
    </table>
</div>

Screenshot