<SerializableAttribute()>
Public Class DebugAssertionFailedException 
   Inherits System.ApplicationException

[SerializableAttribute()]
public class DebugAssertionFailedException : System.ApplicationException 

DebugLockFactory<SimpleReadWriteLocking> factory = new DebugLockFactory<SimpleReadWriteLocking>(
    false, 0, 1, false, 1);

using (ILockStrategy lck = factory.Create())
{
    using (lck.Write())
    using (lck.Write()) //second lock, allow recurse 1 time as per constructor
    {
        try { using (lck.Write()) { Assert.Fail(); } }
        catch (Exception ex)
        {
            Assert.IsTrue(ex is DebugAssertionFailedException);//nesting prohibited by debug lock
        }
    }

    using (lck.Read())
    using (lck.Read()) //second lock, allow recurse 1 time as per constructor
    {
        try { using (lck.Read()) { Assert.Fail(); } }
        catch (Exception ex)
        {
            Assert.IsTrue(ex is DebugAssertionFailedException);//nesting prohibited by debug lock
        }
    }
}

Dim factory As New DebugLockFactory(Of SimpleReadWriteLocking)(False, 0, 1, False, 1)

Using lck As ILockStrategy = factory.Create()
    Using lck.Write()
        Using lck.Write()
            'second lock, allow recurse 1 time as per constructor
            Try
                Using lck.Write()
                    Assert.Fail()
                End Using
            Catch ex As Exception
                    'nesting prohibited by debug lock
                Assert.IsTrue(TypeOf ex Is DebugAssertionFailedException)
            End Try
        End Using
    End Using

    Using lck.Read()
        Using lck.Read()
            'second lock, allow recurse 1 time as per constructor
            Try
                Using lck.Read()
                    Assert.Fail()
                End Using
            Catch ex As Exception
                    'nesting prohibited by debug lock
                Assert.IsTrue(TypeOf ex Is DebugAssertionFailedException)
            End Try
        End Using
    End Using
End Using