Public Shared ReadOnly Property FirstIdentity As UInteger

public static uint FirstIdentity {get;}

uint handle;
byte[] bytes = RandomBytes(2140);
using (TempFile temp = new TempFile())
{
    using (TransactedCompoundFile test = new TransactedCompoundFile(new TransactedCompoundFile.Options(temp.TempPath) { BlockSize=512, CreateNew = true }))
    {
        Assert.AreEqual(TransactedCompoundFile.FirstIdentity, test.Create());
        test.Write(TransactedCompoundFile.FirstIdentity, Encoding.UTF8.GetBytes("Roger was here."), 0, 15);
        Assert.AreEqual("Roger was here.", Encoding.UTF8.GetString(IOStream.ReadAllBytes(test.Read(TransactedCompoundFile.FirstIdentity))));

        for (int i = 0; i < 10; i++)
        {
            var id = test.Create();
            test.Write(id, bytes, i, 300);
            if (i % 2 == 0)
                test.Delete(id);
        }

        handle = test.Create();
        test.Write(handle, bytes, 1000, bytes.Length - 1000);
        CompareBytes(bytes, 1000, bytes.Length - 1000, IOStream.ReadAllBytes(test.Read(handle)));

        test.Write(handle, bytes, 0, bytes.Length);
        CompareBytes(bytes, 0, bytes.Length, IOStream.ReadAllBytes(test.Read(handle)));

        test.Commit();
    }
    using (TransactedCompoundFile test = new TransactedCompoundFile(new TransactedCompoundFile.Options(temp.TempPath) { BlockSize=512, CreateNew = false }))
    {
        Assert.AreEqual("Roger was here.", Encoding.UTF8.GetString(IOStream.ReadAllBytes(test.Read(TransactedCompoundFile.FirstIdentity))));
        CompareBytes(bytes, 0, bytes.Length, IOStream.ReadAllBytes(test.Read(handle)));
    }
}

Dim handle As UInteger
Dim bytes As Byte() = RandomBytes(2140)
Using temp As New TempFile()
    Using test As New TransactedCompoundFile(New TransactedCompoundFile.Options(temp.TempPath) With { _
        Key .BlockSize = 512, _
        Key .CreateNew = True _
    })
        Assert.AreEqual(TransactedCompoundFile.FirstIdentity, test.Create())
        test.Write(TransactedCompoundFile.FirstIdentity, Encoding.UTF8.GetBytes("Roger was here."), 0, 15)
        Assert.AreEqual("Roger was here.", Encoding.UTF8.GetString(IOStream.ReadAllBytes(test.Read(TransactedCompoundFile.FirstIdentity))))

        Dim i As Integer = 0
        While i < 10
            Dim id As var = test.Create()
            test.Write(id, bytes, i, 300)
            If i Mod 2 = 0 Then
                test.Delete(id)
            End If
            System.Math.Max(System.Threading.Interlocked.Increment(i),i - 1)
        End While

        handle = test.Create()
        test.Write(handle, bytes, 1000, bytes.Length - 1000)
        CompareBytes(bytes, 1000, bytes.Length - 1000, IOStream.ReadAllBytes(test.Read(handle)))

        test.Write(handle, bytes, 0, bytes.Length)
        CompareBytes(bytes, 0, bytes.Length, IOStream.ReadAllBytes(test.Read(handle)))

        test.Commit()
    End Using
    Using test As New TransactedCompoundFile(New TransactedCompoundFile.Options(temp.TempPath) With { _
        Key .BlockSize = 512, _
        Key .CreateNew = False _
    })
        Assert.AreEqual("Roger was here.", Encoding.UTF8.GetString(IOStream.ReadAllBytes(test.Read(TransactedCompoundFile.FirstIdentity))))
        CompareBytes(bytes, 0, bytes.Length, IOStream.ReadAllBytes(test.Read(handle)))
    End Using
End Using