An exception of type 'System.NullReferenceException' occurre

Dec 18 2017 12:51 AM
using DemoGrids.Models;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using System.Data.Entity;
using System.Text;
namespace DemoGrids.BussinessService
{
public class BussinessServices
{
public variable GetCustomers(String Word, int Page, int rows, string searchString)
{
variable v = new variable();
List<CustomerViewModel> customermodel = new List<CustomerViewModel>();
using (DatabaseContext db = new DatabaseContext())
{
v.PageIndex = Convert.ToInt32(Page) - 1;
v.PageSize = rows;
customermodel = (from customer in db.Customers
select new CustomerViewModel
{
CustomerID = customer.CustomerID,
ContactName = customer.ContactName,
ContactTitle = customer.ContactTitle,
City = customer.City,
PostalCode = customer.PostalCode,
Country = customer.Country,
Phone = customer.Phone
}).ToList();
v.totalRecords = customermodel.Count();
v.totalPages = (int)Math.Ceiling((float)v.totalRecords / (float)rows);
if (v.sort.ToUpper() == v.DESC)   // getting error here 
// if (v.sort.ToUpper() == "DESC")
{
customermodel = customermodel.OrderByDescending(s => s.CustomerID).ToList();
customermodel = customermodel.Skip(v.PageIndex * v.PageSize).Take(v.PageSize).ToList();
}
else
{
customermodel = customermodel.OrderBy(s => s.CustomerID).ToList();
customermodel = customermodel.Skip(v.PageIndex * v.PageSize).Take(v.PageSize).ToList();
}
if (!string.IsNullOrEmpty(searchString))
{
customermodel = customermodel.Where(m => m.Country == searchString).ToList();
}
var jsonData = new
{
total = v.totalPages,
Page,
records = v.totalRecords,
rows = customermodel
};
return new variable {total=v.totalPages,PageIndex=v.PageIndex,records=v.records,customerModel= customermodel };
}
}
}
}

Answers (5)