linq query issues multiple tables - asp.net

Question

Here is what I have guys/girls...I have 3 tables as follows (only included important columns):
ITEMS:
ItemId Name ItemLocationId
20 Portal Orange 12
21 Portal Blue 13
ITEMLOCATIONS:
ItemLocationid ItemId CreateDate LocationIf
13 21 3/26/2017 2:19:15 AM 5
14 20 3/27/2017 6:25:45 PM 6
15 21 3/31/2017 12:17:25 AM 6
16 21 3/31/2017 12:18:42 AM 5
17 21 3/31/2017 12:20:23 AM 6
LOCATIONS
LocationId Name
5 Storage Room
6 Boss Room
My issue lies in the itemlocations table...I only need the most recent ItemLocation in the table...The others are for historical value...here is the query I am running now
Dim i = From r In mydb.Items
Join il In mydb.ItemLocations On r.ItemLocationId Equals il.ItemLocationId
Join l In mydb.Locations On il.LocationId Equals l.LocationId
Where r.CompanyId = UserPro.CompanyId
Select r.ItemId, r.Name, Location = l.Name
this is returning the first itemlocation in the table for that item...how do I get only the one with then most recent

Answer 1

did not have database available so sketched answer for you in LinqPad.
You need to select by date:
void Main()
{
List<Item> Items = new List<Item> { new Item { ItemID=20, ItemLocationID=12, Name="Portal Orqange"},
new Item{ ItemID=21, ItemLocationID=13, Name="Portal Blue"}};
List<ItemLocation> ItemLocations = new List<ItemLocation> {
new ItemLocation {ItemLocationID=13, ItemId=21, CreateDate=DateTime.Parse("3/26/2017 2:19:15 AM"), LocationId=5},
new ItemLocation {ItemLocationID=14, ItemId=20, CreateDate=DateTime.Parse("3/27/2017 6:25:45 PM"), LocationId=6},
new ItemLocation {ItemLocationID=15, ItemId=21, CreateDate=DateTime.Parse("3/31/2017 12:17:25 AM"), LocationId=6},
new ItemLocation {ItemLocationID=16, ItemId=21, CreateDate=DateTime.Parse("3/31/2017 12:18:42 AM"), LocationId=5},
new ItemLocation {ItemLocationID=17, ItemId=21, CreateDate=DateTime.Parse("3/31/2017 12:20:23 AM"), LocationId=6},
};
List<Location> Locations = new List<Location> { new Location { LocationID=5, Name="Storage Room"},
new Location { LocationID=6, Name="Boss Room"}
};
Items.Join(ItemLocations, i => i.ItemID, il => il.ItemId, (i, il) => new { i, il }).OrderByDescending(i =>i.il.CreateDate )
.Join(Locations, iil => iil.il.LocationId, il=>il.LocationID, (lc, c) => new {lc,c}).FirstOrDefault()
.Dump();
}
// Define other methods and classes here
public class Item
{
public int ItemID { get; set; }
public string Name { get; set; }
public int ItemLocationID { get; set;}
}
public class ItemLocation
{
public int ItemLocationID { get; set; }
public int ItemId { get; set; }
public DateTime CreateDate { get; set; }
public int LocationId { get; set;}
}
public class Location
{
public int LocationID { get; set; }
public string Name { get; set;}
}
When ready to code, just replace Dump() which is LinqPad specific to Select.
Result as follows:

Answer 2

What about this one
Dim groupQuery=from il mydb.ItemLocations
.group il by il.ItemId into gl
select gl.orderByDescending(g=>g.CreateDate).First();
Dim i = From r In mydb.Items
Join il In groupQuery On r.ItemLocationId Equals il.ItemLocationId
Join l In mydb.Locations On il.LocationId Equals l.LocationId
Where r.CompanyId = UserPro.CompanyId
Select r.ItemId, r.Name, Location = l.Name