Force form resize to diagonaly only

I have a c# windows form project. I want the form to maintain the aspect ratio if the user grabs the resize grip in bottom corner. In other words for the form to resize diagonally only. Does anyone have a sample code or class to perform this?

I am using Visual Studio 2017 pro with a c# .NET 4.6.2 winform project.
Don VonderBurgPresident/CEOAsked:
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so what if the user grabs form from one side? would this allow user to resize freely horizontally?, is that what you want?
Don VonderBurgPresident/CEOAuthor Commented:
I would like to prevent a side grab if possible too. But I was taking it one step at a time.
I suggest you override WndProc

newwidth= (ratio width * Form height) / ratio height
newheight=(ratio height * Form width) / ratio width

Here is an example with code where this technique is used, this one uses WndProc because resizing using windows forms events makes it flicker a lot, (it is a post event)) but with WndProc all calculations and redraws are done before the actual resize happens.
Resize and Keep AR

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Don VonderBurgPresident/CEOAuthor Commented:
Thank you.
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