codeql/csharp/ql/test/query-tests/API Abuse/MissingDisposeMethod/MissingDisposeMethodBad.cs

using System;
using System.IO;

class BadBase : IDisposable
{
    private FileStream stream1 = new FileStream("a.txt", FileMode.Open);

    public virtual void Dispose()
    {
        stream1.Dispose();
    }
}

class Bad : BadBase // $ Alert
{
    private FileStream stream2 = new FileStream("b.txt", FileMode.Open);
}