Treeview problems in WinForm C#

Programming in C#: Treeview problems in WinForm C# on newest questions tagged c# – Stack Overflow

I’ve table in database ItemList that hold ProdutID with ItemID.

ProductID    ItemID
  AAA         1001
  AAA         1002
  AAA         1003
  BBB         1201
  BBB         1293
  CCC         1040
  DDD         2011
  DDD         3203

I want add all those data to Treeview Like this:

+AAA
 - 1001
 - 1002
 - 1003
+BBB
 - 1201
 - 1293
+CCC
 - 1040
+DDD
 - 2011
 - 3203

please teach me how to do this. Thanks.

edit :

i try to add each item into ArrayList with length 2 data (ProductID, ItemID)

   for(int i=0;i<arrayList.count;i++)
    {
       TreeNode treeNode = new TreeNode(((string[])arrayList[i])[0]);
       treeview1.Nodes.Add(treeNode);
}

source: http://stackoverflow.com/questions/11287178/treeview-problems-in-winform-c-sharp
Programming in C#: programming-in-c