RemoveDrawObject doesn't delete

[jakjak74]

Hi
I am trying to remove some lines I had created before with RemoveDrawObject but it seems it doesn't work.
For example the line can be created after the order is working
if (order.OrderState == OrderState.Working)
{
IHorizontalLine buyLine = DrawHorizontalLine(order.Name, order.LimitPrice, Color.DarkBlue);
}

And removed when the order is filled
if (order.OrderState == OrderState.Filled)
{
RemoveDrawObject(order.Name);
}

While the creation works fine, I don't see the removal process. I have tried to unlock the buyLine but that didn't help (buyLine.Locked = false)
I have also tried this suggested in the link below without success.

http://ninjatrader.com/support/forum/showthread.php?t=51421

How can I manage to remove these lines, otherwise they keep accumulating?

Thanks for your help

[NinjaTrader_PatrickH]

Hello jakjak74,

Thank you for your post.

Print the name of the order to the Output window when the Horiztonal Line is drawn and when you attempt to remove it.
For information on Print please visit the following link: http://ninjatrader.com/support/helpGuides/nt7/print.htm
You can access the Output window under Tools > Output.

This will show you if the order.Name is the same when the drawing object is created and when attempting to remove.

Please let me know if you have any questions.

[jakjak74]

Hello Patrick

I found my error thanks to your suggestion.
Does the RemoveDrawObject delete also the object in the memory? I want to get rid completely of these objects gradually. If not, how can I force the graphical object to pass to the garbage collector?

[NinjaTrader_PatrickH]

Hello jakjak74,

Thank you for your response.

Garbage Collection in .Net cannot be forced through NinjaScript. The removal of the visual object and it's identification in the collection is all that can be performed through NinjaScript.

Please let me know if you have any questions.

[jakjak74]

Thanks. Is there any way of releasing the memory when we remove Graphical objects? From your answer I understand no.
My Concern is a not gradually released memory for a Strategy which is supposed to run in production for long time.

[NinjaTrader_PatrickH]

Hello jakjak74,

Thank you for your response.

I understand your concern on the memory. You may wish to adjust the Drawing Object rather than removing it, to prevent multiple instances in memory.
For example, instead of removing the object, set it to a transparent color. Then when the order is active, set the color back to the desired color and set the y value.

Please let me know if you have any questions.

[jakjak74]

I understand your suggestion, however if I have many of these objects and need to find easily which one is which, this becomes a headache.
Would be good to have deletion functionality in the future if possible.

Thanks Patrick for your help