How to load a huge amount of data into a kendo grid

web method:

   <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

script:

$(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"
                   }
               }
           }
       });
   });

with this condition (PACK_DATE> "1388/11/07" 366 records ) everything works well. But when I change the date to 1388/11/06 1260 records or 1388/11/05 5460 records or ... the following error occurs:

{ "": " JSON JavaScriptSerializer. maxJsonLength.", "StackTrace": "at System.Web.Script.Serialization.JavaScriptSerializer. (Object obj, StringBuilder, SerializationFormat serializationFormat)\\      System.Web.Script.Serialization.JavaScriptSerializer.Serialize( OBJ,      SerializationFormat serializationFormat)\r\n         System.Web.Script.Services.RestHandler.InvokeMethod(HttpContext ,          WebServiceMethodDataData, IDictionary`2 rawParams)\r\n
          System.Web.Script.Services.RestHandler.ExecuteWebServiceCall(HttpContext , WebServiceMethodData methodData)",           "ExceptionType": "System.InvalidOperationException" }

, - . ?
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