Hi Tumer,
Thanks for contacting Syncfusion Forums.
QUERY: How to send data to controller
From your query we understand that you need to pass data to controller on saving data in dialog template of treegrid.
Please refer the below help documentation,
You can use remote save adaptor in which we have handled CRUD operations on server end.
If you have further queries, please get back to us.
Regards,
Padmavathy Kamalanathan