find a special node in InOrder algoritm

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C#

hi we have a binary search tree (BST),this tree include numbers 10,5,19,-3,8,16,20 this tree with LNR algoritm =-3,5,8,10,16,19,20
I want to find the next node after the node that was specified
example select node 10 and result return me 16
How to do it ?
algoritm?
tanz for all