How to transfer execution control from textbox to user control when user pressed enter/numpad6 key?

I have written code to paint 4 rectangles on user control, next to 1 rectangle 开发者_如何学Gothere is 1 textbox. I wanted to transfer execution control from textbox to user control(in which I wrote code for rectangles) after pressing enter/numpad6 key by entering text in textbox. I written code in textbox keydown event but it won't work.If any any find solution please let me know.

This is not complete answer to your question but this So question will give you clue how to know that user has pressed the Numpad 6 key.