Public Overloads Function TryAdd( _
   ByVal key As TKey, _
   ByVal value As TValue _
) As Boolean

public bool TryAdd( 
   TKey key,
   TValue value
)

try
{
    using (BPlusTree<int, string> tree = new BPlusTree<int, string>(Options))
    {
        Assert.IsTrue(tree.TryAdd(1, "hi"));
        TempFile.Delete();
    }
    Assert.Fail();
}
catch(IOException) { }

Try
    Using tree As New BPlusTree(Of Integer, String)(Options)
        Assert.IsTrue(tree.TryAdd(1, "hi"))
        TempFile.Delete()
    End Using
    Assert.Fail()
Catch generatedExceptionName As IOException
End Try