jQuery Email Address AutoComplete ASP.Net: Get Email Provider domain name from database

This way

HTML

<script src="http://ajax.aspnetcdn.com/ajax/jQuery/jquery-1.10.0.min.js" type="text/javascript"></script>
<script src="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/jquery-ui.min.js" type="text/javascript"></script>
<link href="http://ajax.aspnetcdn.com/ajax/jquery.ui/1.9.2/themes/blitzer/jquery-ui.css"
    rel="Stylesheet" type="text/css" />
<script type="text/javascript">
    $(function () {
        $("[id*=txtSearch]").autocomplete({
            source: function (request, response) {
                if (request.term.indexOf('@') != -1 && request.term.split('@')[1] != '') {
                    $.ajax({
                        url: 'Default.aspx/GetProviders',
                        data: "{ 'prefix': '" + request.term.split('@')[1] + "'}",
                        dataType: "json",
                        type: "POST",
                        contentType: "application/json; charset=utf-8",
                        success: function (data) {
                            if (data.d.length > 0) {
                                response($.map(data.d, function (item) {
                                    return {
                                        label: request.term.split('@')[0] +  "@" + item.split('-')[0],
                                        val: request.term.split('@')[0] + "@" + item.split('-')[0]
                                    };
                                }))
                            } else {
                                response([{ label: 'No results found.', val: -1}]);
                            }
                        }
                    });
                }

            },
            select: function (e, u) {
                if (u.item.val == -1) {
                    return false;
                }
            }
        });
    });
</script>
Enter search term:
<input type="text" id="txtSearch" style = "width:150px" />

Code

[System.Web.Services.WebMethod]
[System.Web.Script.Services.ScriptMethod()]
public static string[] GetProviders(string prefix)
{
    List<string> providers = new List<string>();
    providers.Add("gmail.com");
    providers.Add("yahoo.com");
    providers.Add("outlook.com");
    providers.Add("rediff.com");
    return providers.Where(f => f.Contains(prefix.ToLower())).ToArray();
}

Screenshot