How to get Array values from webmethod to jquery for display?

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C#

SQL

jQuery

I want to display the data from database on some time interval so I used Timer control, but on every tick fire the div (chat box) minimizing, so I want to avoid this minimizing on every post back I used Jquery to webmethode concept like below.

to call C# array type webmethod.

<script type="text/javascript">
        $(document).ready(function () {
            $("#tblCustomers tbody tr").remove();
            $.ajax({
                type: "POST",
                url: "GetDataByJquery.aspx/GetMessages",
                data: '{roomId: "' + $("[id$=lblRoomId]").html() + '" }',
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (data) {
                    response($.map(data.d, function (item) {
                        var rows = "<tr>"
                    + "<td class='customertd'>" + item.Username + "</td>"
                    + "<td class='customertd'>" + item.Sex + "</td>"
                    + "<td class='customertd'>" + item.Text + "</td>"
                    + "<td class='customertd'>" + item.TimeStamp + "</td>"
                    + "<td class='customertd'>" + item.UserID + "</td>"
                    + "</tr>";
                        $('#tblCustomers tbody').append(rows);
                    }))
                },
                failure: function (response) {
                    alert(response.d);
                }
            });
        });
    </script>

Got data from sqlserver and reterning in array.

public static Messages[] GetMessages(string roomId)
   {
       List<Messages> messages = new List<Messages>();
       string strConnString = ConfigurationManager.ConnectionStrings["LinqChatConnectionString"].ConnectionString;

       using (SqlConnection con = new SqlConnection(strConnString))
       {
           using (SqlDataAdapter sda = new SqlDataAdapter())
           {
               string query = "[Get_Messages]";
               SqlCommand cmd = new SqlCommand(query);
               cmd.CommandType = CommandType.StoredProcedure;
               cmd.Parameters.AddWithValue("@roomId", roomId);
               cmd.Connection = con;
               sda.SelectCommand = cmd;
               con.Open();
               SqlDataReader reader = cmd.ExecuteReader();

               while (reader.Read())
               {
                   Messages message = new Messages();
                   message.Username = reader.GetString(0);
                   message.Sex = reader.GetString(1);
                   message.Text = reader.GetString(2);
                   message.TimeStamp = reader.GetDateTime(3);
                   message.UserID = reader.GetInt32(4);
                   messages.Add(message);
               }
           }
       }
       return messages.ToArray();
   }

but I can't display the data..so how to display it?