parent child task relation

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C#

TFS

VSTS

hi all,

i want to find out the solutuion for my problem .

problem is

in tfs 2010 (requirements)

when we create task in requirements like child task and requiremnt is parent.

then if we close requirement then is successfully closes it but i want that it should not be closed until its child task does not closes.

or if child task does not close then the requirements does not clsoe.....