windows forms1 to form2

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C#

from1 i have treeview which is populated from sql common table structrure(CTE)
and from2 i have combobox and textbox and two button.
one button save the recored in the sql table and other button name is close.

when i selected the parentid and parentname from combobox and enter his child in the textbox saving to sql
after i closed the button from1 treeview should populate.

how to do from from2 to from1 treeview update from sql.


i have to update treeview from from2 to from1.