Delete particular textbox from 5 dynamically created textbox

Hi, go through my code attached herewith, after lot of experimenting around:

 

My actual requirement is (and the attached program only has the logic part, not my exact requirement though) :

A form having a pictureBox (say pictureBox1 - the main and bigger picture box) and a small pictureBox (say pictureBox2) along with a textBox (say textBox2). After I run my program, I want to click and drag textBox2 and pictureBox2, separately, on to pictureBox1. While dragging, I want a copy of the controls to be dragged, because, again I may require to drag more controls (pictureBox/textBox). After dragging copies of both pictureBox and textBox, I want to delete one of the newly created textBox or pictureBox, using 'delete' key on the keyboard. I am able to delete pictureBox by only setting textBox Enabled=false. But deleting textBox itself is not becoming possible. Also, if textBox is present, I am unable to even delete the pictureBox.

 

My attached code now deletes the textBox through mouseDown Left key pressed true and not through key pressed = delete. But, my picture box is able to get deleted using the delete key pressed event. How to delete the textBox through delete key event and also, the same should happen when more than one textBoxes are created/dragged on to the bigger pictureBox (pictureBox1).

 

Hope I am clear in my explanation. In case any further clarification required, please let me know.

 

Thank you. 

Can you share code? who is the parent of dynamically created textbox?