Devexpress treelist structure with child nodes

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C#

DevExpress

TreeListView

<pre lang="c#">

Hello
I have a Database table for "Products Group" that has a field name "Parent ID". for example if you have "Refrigerator" as you Product ID, it has the "Kitchen Ware" ID as it's Parent ID. How can I have a treeList in DevExpress to have child nodes under it's parent? My database is SQL server.

I have add a treeList in my form that has 2 colomn, then add a class to fetch data from sql database :

public List<LocalProductGroups> GetProductGroups()
       {
           using (ShoppingEntities _ShoppingEntities = new ShoppingEntities())
           {
               return _ShoppingEntities.ProductGroup.Select(s => new LocalProductGroups
               {
                   GroupID=s.GroupID,
                   Name=s.Name,
                   Parent=s.Parent
               }).ToList();
           }

       }
       public partial class LocalProductGroups
       {
           public int GroupID { get; set; }
           public string Name { get; set; }
           public int Parent { get; set; }
           public bool IsRemove { get; set; }
       }

data is shown in treelist but not in parent and child format, I mean all Product Goups are in one level.

Thanks in Advance

What I have tried:

I have tried my code above based on DevExpress documentations, but I have not met my answer.