System.Windows.Forms.Control.Parent.get returned null

Question

Dear All,

I get an error as follows. The codes of the application are shown below the screen capture.

• Error *

• Call stack *

• Code of ypanel *

• Solution Explorer *

Answer 1

I think that the parent is not yet available because the control was not added yet to a form or control.

Try executing the code inside the Load or ParentChanged event handlers.

Answer 2

When writing your code to read the value of .Parent, you should consider that null is a valid input, as documented by Microsoft in places such as

https://learn.microsoft.com/en-us/dotnet/api/system.windows.forms.control.parent?view=windowsdesktop-7.0#remarks

Setting .Parent to null explicitly has its meaning. And if you don't like that, you should assign whatever you like to .Parent when creating such UI controls.