The TreeSetNamedSecurityInfo function sets specified security information in the security descriptor of a specified tree of objects. This function allows a specified discretionary access control list (DACL) or any elements in the system access control list (SACL) to be propagated throughout an entire tree. This function supports a callback function to track the progress of the tree operation.

[DllImport("advapi32.dll", EntryPoint = "TreeSetNamedSecurityInfoW", SetLastError = true, CharSet = CharSet.Unicode)]

static extern uint TreeSetNamedSecurityInfo(string pObjectName, SE_OBJECT_TYPE ObjectType, SecurityInformation SecurityInfo,

    uint errorReturn = TreeSetNamedSecurityInfo(path, SE_OBJECT_TYPE.SE_FILE_OBJECT, si, pSidOwner, pSidGroup, pDacl, pSacl, TREE_SEC_INFO_SET, callback, PROGRESS_INVOKE_SETTING.ProgressInvokePrePostError, pArgs);