Error during serialization or deserialization using the JSON JavaScriptSerializer.

[Meysam]

hi this is my code:

<WebMethod()>

   Public Shared Function Pcpacking() As IEnumerable(Of Packing)

       Dim db As New STOREEntities

       Return db.PC_PACKING_HISTORIES. _

       Where(Function(q) q.PACK_DATE > "1388/11/07"). _

       Select(Function(q) New Packing _

                  With {.Packdate = q.PACK_DATE,

                        .Packserialnumber = q.PACK_SERIAL_NUMBER,

                        .Netweight = q.NET_WEIGHT,

                        .Packusername = q.PACK_USER_NAME}).ToList()

   End Function

$(function () {

           $("#grid").kendoGrid({

               height: 200,

               columns: [

                    { field: "Packserialnumber", width: "150px" },

                   { field: "Netweight", width: "50px" },

                   { field: "Packusername", width: "150px" },

                   { field: "Packdate", width: "100px" }

               ],

               editable: false,

               dataSource: {

                   schema: {

                       data: "d",

                       model: {

                           id: "Packserialnumber",

                           fields: {

                               Packserialnumber: { editable: false, nullable: true },

                               Netweight: { type: "number", validation: { required: true, min: 1} },

                               Packusername: { validation: { required: true} },

                               Packdate: { validation: { required: true} }

                           }

                       }

                   },

                   batch: false,

                   transport: {

                       read: {

                           url: "Default.aspx/Pcpacking",

                           contentType: "application/json; charset=utf-8",

                           type: "POST"

                       }

                   }

               }

           });

       });

when q.pack_date > "1388/11/07" everything works well and  query retrive 366. if i change date(q.pack_date > "1388/11/06"  1219 records) getting error:
{"Message":"Error during serialization or deserialization using the JSON JavaScriptSerializer.
 The length of the string exceeds the value set on the maxJsonLength property.
 ","StackTrace":"   at System.Web.Script.Serialization.JavaScriptSerializer.
 Serialize(Object obj, StringBuilder output, SerializationFormat serializationFormat)\r\n
    at System.Web.Script.Serialization.JavaScriptSerializer.Serialize(Object obj,
     SerializationFormat serializationFormat)\r\n
       at System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext context,
        WebServiceMethodData methodData, IDictionary`2 rawParams)\r\n  
         at System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext context, WebServiceMethodData methodData)",
         "ExceptionType":"System.InvalidOperationException"}

sorry for my bad english

[Meysam]

I think kendo.grid dont support large data.
Any suggestions?