Extension > How do I place a person in a tree in custom code?
# Question
How do I place a person in a tree in custom Extension code?
# Answer
Sometimes in code, you'll need to place a person in a tree. The Extension makes that possible quite easily, but the syntax isn't readily clear.
### A word of caution:
> Trees are important to the business, so making mistakes here can result in a lot of work. Please make sure you're comfortable with tree structure, tree types, and that you know how to test and check the results of moves in Corp Admin.
The concept of a **node** is used. This is a spot in the tree, and it "knows" about itself: who its parent is, and who it contains.
The "ValidatePlacement" call you see is to make sure you don't create circular references.
Here, we're placing in the "Enroller Tree". For Unilevel and Enroller tree, you need to specify the LegName as "LegName.Empty", not just "null", or you'll get a null reference exception. For Binary or Matrix trees, you can use the appropriate LegNames in that enumeration.
```csharp
var _nodeId = new DirectScale.Disco.Extension.NodeId(_associate.AssociateId);
var enrollernodeDetail = _treeService.GetNodeDetail(_nodeId, TreeType.Enrollment);
try
{
_treeService.ValidatePlacements(
new Placement[] {
new Placement() {
Tree = TreeType.Unilevel,
NodeDetail = new NodeDetail() { NodeId = _nodeId, UplineId = enrollernodeDetail.UplineId, UplineLeg = LegName.Empty }
}
});
_treeService.Place(new Placement[] {
new Placement() {
Tree = TreeType.Unilevel,
NodeDetail = new NodeDetail() { NodeId = _nodeId, UplineId = enrollernodeDetail.UplineId, UplineLeg = LegName.Empty }
};
});
}
```
Posted by Russell Kloepfer about 3 years ago
