<%:Html.DropDownListFor(m=>m.FatherId,Model.father,new{id="drpFatherId",disabled="true"})%>

<%:Html.TextBoxFor(m => m.FatherName, new { id = "txtfatherName"})%><br />

<span style="color:Red;" id="Error"></span>

$("input#txtfatherName").change(function () {
        //alert("message");
        var term = $(this).val();
        $.ajax(
        {
            url: 'Home/getFatherId',
            type: 'POST',
            data: { term: term },
            dataType: 'json',
            Success: function (data) {
                if (data != 0) {
                    $("#drpFatherId").val(data);
                    document.getElementById("Error").innerHTML = "";
                }
                else {
                    $("#drpFatherId").val(0);
                    document.getElementById("Error").innerHTML = "Our System does not recognize this father name. please try again.";
                    $("#txtfatherName").focus();
                }
            }
        });
    });

public JsonResult getFatherId(string term)
{
    int fatherId = 0;
    using (ManageMembers mngMembrs = new ManageMembers())
    {
        Member data = mngMembrs.getFatherID(term);
        if (data != null)
            fatherId = data.ID;
    }
    return Json(fatherId, JsonRequestBehavior.AllowGet);
}