Manager to accountname resolving in extension

I have an Oracle MA with table with collumns:

UserID / UserFIRSTName / ManagerID (reference)

01 /  Jack / 02

02  /  Bill / (null)

I need to create extension in c# to resolve ManagerID to his accountname to write this attribute in special parameter in AD.

Manager account name I can get from AD using UserID.

Can somebody say how it can be done?

Thanks!

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