JSON Lists not removing duplicates with Distinct command - asp.net

Question

Currently I am querying a web service that returns a JSON string.
url = #"redacted url;
returnValue = new WebClient().DownloadString(url);
I am putting the return results into a list of items defined in a model class. I am then running a second JSON call searching a different field with that same search term.
url2 = #"redacted url2;
returnValue2 = new WebClient().DownloadString(url2);
I then create my lists and combine the lists using AddRange.
List<Order> shipments = JsonConvert.DeserializeObject<List<Order>>(returnValue);
List<Order> shipments2 = JsonConvert.DeserializeObject<List<Order>>(returnValue2);
shipments.AddRange(shipments2);
As a result there are some duplicates. To try and only return unique records I am using the command Distinct when sending to my MVC view from the controller.
return View(shipments.OrderBy(x => x.dtDateReceived).Distinct().ToList());
But for some reason it's still returning duplicates.
Any ideas on what I am doing wrong here?
Thanks in advance for any help!

Answer 1

I ended up correcting it using Shyju's comment above.
I changed the Distinct to the following.
return View(shipments.OrderBy(x => x.dtDateReceived).Distinct(new OrderComparer()).ToList());
Then built the following compare functions
// Custom comparer for the Order class
class OrderComparer : IEqualityComparer<Order>
{
// Orders are equal if their names and order numbers are equal.
public bool Equals(Order x, Order y)
{
//Check whether the compared objects reference the same data.
if (Object.ReferenceEquals(x, y)) return true;
//Check whether any of the compared objects is null.
if (Object.ReferenceEquals(x, null) || Object.ReferenceEquals(y, null))
return false;
//Check whether the order's properties are equal.
return x.sWorkOrderNumber == y.sWorkOrderNumber && x.sCustomerOrderName == y.sCustomerOrderName;
}
// If Equals() returns true for a pair of objects
// then GetHashCode() must return the same value for these objects.
public int GetHashCode(Order order)
{
//Check whether the object is null
if (Object.ReferenceEquals(order, null)) return 0;
//Get hash code for the sCustomerOrderName field if it is not null.
int hashOrderName = order.sCustomerOrderName == null ? 0 : order.sCustomerOrderName.GetHashCode();
//Get hash code for the sWorkOrderNumber field.
int hashOrderCode = order.sWorkOrderNumber.GetHashCode();
//Calculate the hash code for the order.
return hashOrderName ^ hashOrderCode;
}
}