Correct me if I’m wrong but wouldn’t the fix be as simple as this:

public void AddComponent(Component component) {
if (!components_.Contains(component)) {
PutComponentInOrder(component);
component.Parent = this;
}
}

public void PutComponentInOrder(Component component) {
if (components_.Contains(component))
components_.Remove(component);

int i = 0;

for (i = 0; i = component.DrawOrder)
break;

components_.Insert(i, component);
}

So, if the component is already in the list, you can remove it and insert it in its proper place. Otherwise, it must be a new element and just insert it wherever it needs to go.

like between which set of braces or under which, uh, section or sub-section or whatever….i really should learn the names of these things….

anyway, thanks for putting this up here, it’s been most helpful so far, i already worked through the stock tutorials and can’t wait to finish working through yours. i like your approach in basically writing your own engine, all the XNA stuff (obviously) is geared towards microsoft platforms. i appreciate the flexibility and the extra understanding

Second,
I agree with Greg. You would remove more code then you would add. I got this now:

public void AddComponent(Component component)
{
component.Parent = this;
PutComponentInOrder(component);
}

public void PutComponentInOrder(Component component)
{
if (_components.Contains(component))
_components.Remove(component);

var i = 0;

for (i = 0; i = component.DrawOrder)
break;

_components.Insert(i, component);
}