Extracting Data from complex JSON objects in JQuery (AJAX)

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C#

ASP.NET

jQuery

Hello Everyone,
I'm stuck with a problem for few days now, I can really use some help.
I'm trying to pass some data which in form of complex JSON object from a C# method to the WebPage in Jquery, here is my method in C#

[WebMethod]
    public static string getAllDealsInfo()
    {
      SqlDataAdapter adp = new SqlDataAdapter("select top 2 de.[Deal Id], de.Merchant,de.Title, de.ImageSmall from dealdatabase de where [Deal Id] < 84520 order by [Deal Id] desc ", connection);
      DataTable dt = new DataTable();
      adp.Fill(dt);
      List<Dictionary<string, object>> rows = new List<Dictionary<string, object>>();
      Dictionary<string, object> row = null;

      foreach (DataRow dr in dt.Rows)
      {
         row = new Dictionary<string, object>();
         foreach (DataColumn col in dt.Columns)
         {
            row.Add(col.ColumnName, dr[col]);
         }
         rows.Add(row);
      }

      var serializer = new JavaScriptSerializer();
      string json = serializer.Serialize(rows);
      return json;
   }

and here is my Call to method from Jquery side

$.ajax({ 
   type: "POST",
   url: "Default.aspx/getAllDealsInfo",
   data: '{}',
   contentType: "application/json; charset=utf-8",
   dataType: "json",
   success: function (_ObjDeals) {
      var tableData = $.parseJSON(_ObjDeals.d);
      alert(tableData[rows][row]);
   },
   error: function (x, e) {
   alert("The call to the serve Failed ");
   }
});

My Ajax call is successful and i have all the data in "tableData", and here starts the land where I need your help I don't know how to extract all the data.
Thanks.