How to get Array values from webmethod to jquery for display

<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> 

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public static Messages[] GetMessages(string roomId)  

  {       

 List messages = new List();       

 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();    }