String. Is Read Only Method
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Indicates whether this secure string is marked read-only.
public: bool IsReadOnly();
public bool IsReadOnly ();
member this.IsReadOnly : unit -> bool
Public Function IsReadOnly () As Boolean
true if this secure string is marked read-only; otherwise,
This secure string has already been disposed.
After an instance of SecureString is marked read-only by the MakeReadOnly method, any attempt to modify the value of the instance throws an InvalidOperationException. Use the IsReadOnly method to test whether a SecureString is read-only before attempting to modify it.