Thanks Michael for the response.

1) I am using 2013.2 version of infragistics. Version 4.13.2.2157

2) This method converts my collection to json and then passes it on to the grid:

public ActionResult ConvertToJson<T>(ResponseWrapper<T> result)
        {
            ResponsePacket<T> dataViewModel = new ResponsePacket<T>();
            JsonResult jsonResult = new JsonResult();

            var pageSize = HttpUtility.ParseQueryString(Request.Url.Query).Get("pageSize");
            var pageIndex = HttpUtility.ParseQueryString(Request.Url.Query).Get("page");

            if (pageSize == null || pageIndex == null)
            {
                dataViewModel.Records = result.Content;
                dataViewModel.RecordCountKey = result.recordCountKey;
                jsonResult.Data = dataViewModel.Records;
                jsonResult.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            }
            else
            {
                dataViewModel.Records = result.Content.AsQueryable();
                dataViewModel.RecordCountKey = result.recordCountKey;
                jsonResult.Data = dataViewModel;
                jsonResult.JsonRequestBehavior = JsonRequestBehavior.AllowGet;
            }

            return jsonResult;

        }

The grid model is set up on my controller & the gridModel is generic in a way that it is for all the entities & the columns are set up dynamically like this :

 gridModel.Columns.Add(new GridColumn()
                    {

                       //record is my result set which contains the MetaData of the database table
                        HeaderText = record.DisplayName,   
                        Key = record.ColumnName,
                        DataType = record.DataType
                    });