SecurityIdentifier.IsAccountSid Method    
Definition
Important
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Returns a value that indicates whether the security identifier (SID) represented by this SecurityIdentifier object is a valid Windows account SID.
public:
 bool IsAccountSid();public bool IsAccountSid();member this.IsAccountSid : unit -> boolPublic Function IsAccountSid () As BooleanReturns
true if the SID represented by this SecurityIdentifier object is a valid Windows account SID; otherwise, false.