Typical Result or EventArgs Class

public class Result

{

    public bool Success { get; private set; }

    public string Error { get; private set; }

    public bool Failure { /* … */ }

 

    protected Result(bool success, string error) { /* … */ }

 

    public static Result Fail(string message) { /* … */ }

 

    public static Result<T> Ok<T>(T value) {  /* … */ }

}

 

public class Result<T> : Result

{

    public T Value { get; set; }

 

    protected internal Result(T value, bool success, string error)

        : base(success, error)

    {

        /* … */

    }

}