Response to: Passing a generic class to a non generic method

Revision 2
The generic class could inherit from a non-generic class.

public class NodeBase
{
    // Base class stuff here

    public virtual void NodeMethod()
    {
        // Do something
    }
}

public class Note<t> : NodeBase
{
    // Generic class stuff here

    public override void NodeMethod()
    {
        // Do something special
    }
}

Then you can hand it over to the method this way:

public class classname
{
    public void SomeMethod( NodeBase node)
    {
        // Use methods declared in base class
        node.NodeMethod();
    }
}